diff --git content/browser/renderer_host/render_widget_host_view_aura.cc content/browser/renderer_host/render_widget_host_view_aura.cc
index 852e71f..b765a5b 100644
--- content/browser/renderer_host/render_widget_host_view_aura.cc
+++ content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -769,6 +769,13 @@ void RenderWidgetHostViewAura::SetKeyboardFocus() {
     }
   }
 #endif
+#if defined(OS_LINUX)
+  if (has_external_parent_ && CanFocus()) {
+    aura::WindowTreeHost* host = window_->GetHost();
+    if (host)
+      host->Show();
+  }
+#endif
   // TODO(wjmaclean): can host_ ever be null?
   if (host_ && set_focus_on_mouse_down_or_key_event_) {
     set_focus_on_mouse_down_or_key_event_ = false;
diff --git content/browser/renderer_host/render_widget_host_view_base.cc content/browser/renderer_host/render_widget_host_view_base.cc
index 292087d..8d6da47 100644
--- content/browser/renderer_host/render_widget_host_view_base.cc
+++ content/browser/renderer_host/render_widget_host_view_base.cc
@@ -44,6 +44,7 @@ RenderWidgetHostViewBase::RenderWidgetHostViewBase()
       current_display_rotation_(display::Display::ROTATE_0),
       pinch_zoom_enabled_(content::IsPinchToZoomEnabled()),
       text_input_manager_(nullptr),
+      has_external_parent_(false),
       renderer_frame_number_(0),
       weak_factory_(this) {
 }
@@ -324,6 +325,10 @@ void RenderWidgetHostViewBase::FocusedNodeTouched(
   DVLOG(1) << "FocusedNodeTouched: " << editable;
 }
 
+void RenderWidgetHostViewBase::SetHasExternalParent(bool val) {
+  has_external_parent_ = val;
+}
+
 uint32_t RenderWidgetHostViewBase::RendererFrameNumber() {
   return renderer_frame_number_;
 }
diff --git content/browser/renderer_host/render_widget_host_view_base.h content/browser/renderer_host/render_widget_host_view_base.h
index 5e25a02..b81350b 100644
--- content/browser/renderer_host/render_widget_host_view_base.h
+++ content/browser/renderer_host/render_widget_host_view_base.h
@@ -107,6 +107,7 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   void EndFrameSubscription() override;
   void FocusedNodeTouched(const gfx::Point& location_dips_screen,
                           bool editable) override;
+  void SetHasExternalParent(bool val) override;
 
   // This only needs to be overridden by RenderWidgetHostViewBase subclasses
   // that handle content embedded within other RenderWidgetHostViews.
@@ -477,6 +478,10 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   // destroyed before the RWHV is destroyed.
   TextInputManager* text_input_manager_;
 
+  // True if the widget has a external parent view/window outside of the
+  // Chromium-controlled view/window hierarchy.
+  bool has_external_parent_;
+
  private:
   void FlushInput();
 
diff --git content/public/browser/render_widget_host_view.h content/public/browser/render_widget_host_view.h
index ff3127b..e666db1 100644
--- content/public/browser/render_widget_host_view.h
+++ content/public/browser/render_widget_host_view.h
@@ -172,6 +172,10 @@ class CONTENT_EXPORT RenderWidgetHostView {
   // when the value has changed.  Views must initially default to false.
   virtual void SetNeedsBeginFrames(bool needs_begin_frames) = 0;
 
+  // Set whether the widget has a external parent view/window outside of the
+  // Chromium-controlled view/window hierarchy.
+  virtual void SetHasExternalParent(bool val) = 0;
+
 #if defined(OS_MACOSX)
   // Return the accelerated widget which hosts the CALayers that draw the
   // content of the view in GetNativeView. This may be null.
diff --git ui/views/widget/desktop_aura/desktop_screen_win.cc ui/views/widget/desktop_aura/desktop_screen_win.cc
index f772f64..7d13f9f 100644
--- ui/views/widget/desktop_aura/desktop_screen_win.cc
+++ ui/views/widget/desktop_aura/desktop_screen_win.cc
@@ -32,6 +32,8 @@ display::Display DesktopScreenWin::GetDisplayMatching(
 }
 
 HWND DesktopScreenWin::GetHWNDFromNativeView(gfx::NativeView window) const {
+  if (!window)
+    return NULL;
   aura::WindowTreeHost* host = window->GetHost();
   return host ? host->GetAcceleratedWidget() : NULL;
 }
diff --git ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index 964fe4a..b878661 100644
--- ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -86,6 +86,7 @@ DesktopWindowTreeHostWin::DesktopWindowTreeHostWin(
       should_animate_window_close_(false),
       pending_close_(false),
       has_non_client_view_(false),
+      has_external_parent_(false),
       tooltip_(NULL) {
 }
 
@@ -136,8 +137,12 @@ void DesktopWindowTreeHostWin::Init(aura::Window* content_window,
                         native_widget_delegate_);
 
   HWND parent_hwnd = NULL;
-  if (params.parent && params.parent->GetHost())
+  if (params.parent_widget) {
+    parent_hwnd = params.parent_widget;
+    has_external_parent_ = true;
+  } else if (params.parent && params.parent->GetHost()) {
     parent_hwnd = params.parent->GetHost()->GetAcceleratedWidget();
+  }
 
   remove_standard_frame_ = params.remove_standard_frame;
   has_non_client_view_ = Widget::RequiresNonClientView(params.type);
@@ -645,6 +650,10 @@ bool DesktopWindowTreeHostWin::CanActivate() const {
   return native_widget_delegate_->CanActivate();
 }
 
+bool DesktopWindowTreeHostWin::RemoveCaption() const {
+  return GetWidget()->remove_caption();
+}
+
 bool DesktopWindowTreeHostWin::WantsMouseEventsWhenInactive() const {
   return wants_mouse_events_when_inactive_;
 }
@@ -825,11 +834,15 @@ void DesktopWindowTreeHostWin::HandleFrameChanged() {
 }
 
 void DesktopWindowTreeHostWin::HandleNativeFocus(HWND last_focused_window) {
-  // TODO(beng): inform the native_widget_delegate_.
+  // See comments in CefBrowserHostImpl::PlatformSetFocus.
+  if (has_external_parent_ && CanActivate())
+    HandleActivationChanged(true);
 }
 
 void DesktopWindowTreeHostWin::HandleNativeBlur(HWND focused_window) {
-  // TODO(beng): inform the native_widget_delegate_.
+  // See comments in CefBrowserHostImpl::PlatformSetFocus.
+  if (has_external_parent_ && CanActivate())
+    HandleActivationChanged(false);
 }
 
 bool DesktopWindowTreeHostWin::HandleMouseEvent(const ui::MouseEvent& event) {
diff --git ui/views/widget/desktop_aura/desktop_window_tree_host_win.h ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
index 884df90..518a69c 100644
--- ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
+++ ui/views/widget/desktop_aura/desktop_window_tree_host_win.h
@@ -138,6 +138,7 @@ class VIEWS_EXPORT DesktopWindowTreeHostWin
   bool CanMaximize() const override;
   bool CanMinimize() const override;
   bool CanActivate() const override;
+  bool RemoveCaption() const override;
   bool WantsMouseEventsWhenInactive() const override;
   bool WidgetSizeIsClientSize() const override;
   bool IsModal() const override;
@@ -252,6 +253,10 @@ class VIEWS_EXPORT DesktopWindowTreeHostWin
   // True if the window should have the frame removed.
   bool remove_standard_frame_;
 
+  // True if the widget has a external parent view/window outside of the
+  // Chromium-controlled view/window hierarchy.
+  bool has_external_parent_;
+
   // Owned by TooltipController, but we need to forward events to it so we keep
   // a reference.
   corewm::TooltipWin* tooltip_;
diff --git ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 816faa3..4c2d702 100644
--- ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -195,6 +195,7 @@ DesktopWindowTreeHostX11::DesktopWindowTreeHostX11(
       use_native_frame_(false),
       should_maximize_after_map_(false),
       use_argb_visual_(false),
+      has_external_parent_(false),
       drag_drop_client_(NULL),
       native_widget_delegate_(native_widget_delegate),
       desktop_native_widget_aura_(desktop_native_widget_aura),
@@ -208,6 +209,7 @@ DesktopWindowTreeHostX11::DesktopWindowTreeHostX11(
       has_window_focus_(false),
       has_pointer_focus_(false),
       modal_dialog_xid_(0),
+      xwindow_destroyed_(false),
       close_widget_factory_(this),
       weak_factory_(this) {}
 
@@ -545,7 +547,8 @@ void DesktopWindowTreeHostX11::CloseNow() {
   // Actually free our native resources.
   if (ui::PlatformEventSource::GetInstance())
     ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
-  XDestroyWindow(xdisplay_, xwindow_);
+  if (!xwindow_destroyed_)
+    XDestroyWindow(xdisplay_, xwindow_);
   xwindow_ = None;
 
   desktop_native_widget_aura_->OnHostClosed();
@@ -686,6 +689,8 @@ void DesktopWindowTreeHostX11::GetWindowPlacement(
 }
 
 gfx::Rect DesktopWindowTreeHostX11::GetWindowBoundsInScreen() const {
+  if (!screen_bounds_.IsEmpty())
+    return screen_bounds_;
   return ToDIPRect(bounds_in_pixels_);
 }
 
@@ -1208,6 +1213,8 @@ void DesktopWindowTreeHostX11::HideImpl() {
 }
 
 gfx::Rect DesktopWindowTreeHostX11::GetBounds() const {
+  if (!screen_bounds_.IsEmpty())
+    return screen_bounds_;
   return bounds_in_pixels_;
 }
 
@@ -1267,6 +1274,8 @@ void DesktopWindowTreeHostX11::SetBounds(
 }
 
 gfx::Point DesktopWindowTreeHostX11::GetLocationOnNativeScreen() const {
+  if (!screen_bounds_.IsEmpty())
+    return screen_bounds_.origin();
   return bounds_in_pixels_.origin();
 }
 
@@ -1390,9 +1399,15 @@ void DesktopWindowTreeHostX11::InitX11Window(
   attribute_mask |= CWBorderPixel;
   swa.border_pixel = 0;
 
+  gfx::AcceleratedWidget parent_widget = params.parent_widget;
+  if (parent_widget == gfx::kNullAcceleratedWidget)
+    parent_widget = x_root_window_;
+  else
+    has_external_parent_ = true;
+
   bounds_in_pixels_ = ToPixelRect(params.bounds);
   bounds_in_pixels_.set_size(AdjustSize(bounds_in_pixels_.size()));
-  xwindow_ = XCreateWindow(xdisplay_, x_root_window_, bounds_in_pixels_.x(),
+  xwindow_ = XCreateWindow(xdisplay_, parent_widget, bounds_in_pixels_.x(),
                            bounds_in_pixels_.y(), bounds_in_pixels_.width(),
                            bounds_in_pixels_.height(),
                            0,  // border width
@@ -2022,6 +2037,10 @@ uint32_t DesktopWindowTreeHostX11::DispatchEvent(
       }
       break;
     }
+    case DestroyNotify:
+      xwindow_destroyed_ = true;
+      CloseNow();
+      break;
     case FocusIn:
     case FocusOut:
       OnFocusEvent(xev->type == FocusIn, event->xfocus.mode,
diff --git ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
index a4b68b3..bb82659 100644
--- ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
+++ ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
@@ -91,6 +91,12 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   // there is no dialog on the host window.
   XID GetModalDialog();
 
+  void set_screen_bounds(const gfx::Rect& bounds) { screen_bounds_ = bounds; }
+
+  // Returns true if the widget has a external parent view/window outside of the
+  // Chromium-controlled view/window hierarchy.
+  bool has_external_parent() const { return has_external_parent_; }
+
  protected:
   // Overridden from DesktopWindowTreeHost:
   void Init(aura::Window* content_window,
@@ -301,6 +307,9 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   // The bounds of |xwindow_|.
   gfx::Rect bounds_in_pixels_;
 
+  // Override the screen bounds when the host is a child window.
+  gfx::Rect screen_bounds_;
+
   // Whenever the bounds are set, we keep the previous set of bounds around so
   // we can have a better chance of getting the real
   // |restored_bounds_in_pixels_|. Window managers tend to send a Configure
@@ -340,6 +349,10 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   // Whether we used an ARGB visual for our window.
   bool use_argb_visual_;
 
+  // True if the widget has a external parent view/window outside of the
+  // Chromium-controlled view/window hierarchy.
+  bool has_external_parent_;
+
   DesktopDragDropClientAuraX11* drag_drop_client_;
 
   std::unique_ptr<ui::EventHandler> x11_non_client_event_filter_;
@@ -427,6 +440,9 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
 
   XID modal_dialog_xid_;
 
+  // True if the xwindow has already been destroyed.
+  bool xwindow_destroyed_;
+
   base::WeakPtrFactory<DesktopWindowTreeHostX11> close_widget_factory_;
   base::WeakPtrFactory<DesktopWindowTreeHostX11> weak_factory_;
 
diff --git ui/views/widget/widget.cc ui/views/widget/widget.cc
index 68e6acd..07eb1fc 100644
--- ui/views/widget/widget.cc
+++ ui/views/widget/widget.cc
@@ -126,9 +126,11 @@ Widget::InitParams::InitParams(Type type)
       mirror_origin_in_rtl(false),
       shadow_type(SHADOW_TYPE_DEFAULT),
       remove_standard_frame(false),
+      remove_caption(false),
       use_system_default_icon(false),
       show_state(ui::SHOW_STATE_DEFAULT),
       parent(nullptr),
+      parent_widget(gfx::kNullAcceleratedWidget),
       native_widget(nullptr),
       desktop_window_tree_host(nullptr),
       layer_type(ui::LAYER_TEXTURED),
@@ -165,6 +167,7 @@ Widget::Widget()
       auto_release_capture_(true),
       root_layers_dirty_(false),
       movement_disabled_(false),
+      remove_caption_(false),
       observer_manager_(this) {
 }
 
@@ -296,7 +299,8 @@ void Widget::Init(const InitParams& in_params) {
     params.name = params.delegate->GetContentsView()->GetClassName();
 
   params.child |= (params.type == InitParams::TYPE_CONTROL);
-  is_top_level_ = !params.child;
+  is_top_level_ = !params.child || params.parent_widget;
+  remove_caption_ = params.remove_caption;
 
   if (params.opacity == views::Widget::InitParams::INFER_OPACITY &&
       params.type != views::Widget::InitParams::TYPE_WINDOW &&
@@ -360,7 +364,12 @@ void Widget::Init(const InitParams& in_params) {
     }
   } else if (params.delegate) {
     SetContentsView(params.delegate->GetContentsView());
-    SetInitialBoundsForFramelessWindow(params.bounds);
+    if (params.parent_widget) {
+      // Set the bounds directly instead of applying an inset.
+      SetBounds(params.bounds);
+    } else {
+      SetInitialBoundsForFramelessWindow(params.bounds);
+    }
   }
   // This must come after SetContentsView() or it might not be able to find
   // the correct NativeTheme (on Linux). See http://crbug.com/384492
diff --git ui/views/widget/widget.h ui/views/widget/widget.h
index 1e62c09..551518e 100644
--- ui/views/widget/widget.h
+++ ui/views/widget/widget.h
@@ -234,12 +234,17 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
     // rendered, and that the client area should be equivalent to the window
     // area. Only used on some platforms (Windows and Linux).
     bool remove_standard_frame;
+    // Specifies that the system default caption and icon should not be
+    // rendered but the window may still have a resizable border. Only used on
+    // some platforms (Windows and Linux).
+    bool remove_caption;
     // Only used by ShellWindow on Windows. Specifies that the default icon of
     // packaged app should be the system default icon.
     bool use_system_default_icon;
     // Whether the widget should be maximized or minimized.
     ui::WindowShowState show_state;
     gfx::NativeView parent;
+    gfx::AcceleratedWidget parent_widget;
     // Used only by mus and is necessitated by mus not being a NativeView.
     ui::Window* parent_mus = nullptr;
     // Specifies the initial bounds of the Widget. Default is empty, which means
@@ -753,6 +758,10 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   bool movement_disabled() const { return movement_disabled_; }
   void set_movement_disabled(bool disabled) { movement_disabled_ = disabled; }
 
+  // True if the system default caption and icon should not be rendered but the
+  // window may still have a resizable border.
+  bool remove_caption() const { return remove_caption_; }
+
   // Returns the work area bounds of the screen the Widget belongs to.
   gfx::Rect GetWorkAreaBoundsInScreen() const;
 
@@ -971,6 +980,10 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   // disabled.
   bool movement_disabled_;
 
+  // True if the system default caption and icon should not be rendered but the
+  // window may still have a resizable border.
+  bool remove_caption_;
+
   ScopedObserver<ui::NativeTheme, ui::NativeThemeObserver> observer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
diff --git ui/views/widget/widget_hwnd_utils.cc ui/views/widget/widget_hwnd_utils.cc
index b843416..8b81a51 100644
--- ui/views/widget/widget_hwnd_utils.cc
+++ ui/views/widget/widget_hwnd_utils.cc
@@ -114,6 +114,11 @@ void CalculateWindowStylesFromInitParams(
       // See layered window comment above.
       if (*ex_style & WS_EX_COMPOSITED)
         *style &= ~(WS_THICKFRAME | WS_CAPTION);
+
+      if (params.remove_caption) {
+        *style &= ~(WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX |
+                    WS_THICKFRAME);
+      }
       break;
     }
     case Widget::InitParams::TYPE_CONTROL:
diff --git ui/views/win/hwnd_message_handler.cc ui/views/win/hwnd_message_handler.cc
index 020d0a1..4a613f7 100644
--- ui/views/win/hwnd_message_handler.cc
+++ ui/views/win/hwnd_message_handler.cc
@@ -850,6 +850,8 @@ void HWNDMessageHandler::SizeConstraintsChanged() {
   } else {
     style &= ~WS_MINIMIZEBOX;
   }
+  if (delegate_->RemoveCaption())
+    style &= ~(WS_CAPTION | WS_SYSMENU | WS_THICKFRAME);
   SetWindowLong(hwnd(), GWL_STYLE, style);
 }
 
@@ -2472,8 +2474,12 @@ LRESULT HWNDMessageHandler::HandleMouseEventInternal(UINT message,
     active_mouse_tracking_flags_ = 0;
   } else if (event.type() == ui::ET_MOUSEWHEEL) {
     // Reroute the mouse wheel to the window under the pointer if applicable.
-    return (ui::RerouteMouseWheel(hwnd(), w_param, l_param) ||
-            delegate_->HandleMouseEvent(ui::MouseWheelEvent(msg))) ? 0 : 1;
+    if (ui::RerouteMouseWheel(hwnd(), w_param, l_param) ||
+        delegate_->HandleMouseEvent(ui::MouseWheelEvent(msg))) {
+      SetMsgHandled(TRUE);
+      return 0;
+    }
+    return 1;
   }
 
   // There are cases where the code handling the message destroys the window,
diff --git ui/views/win/hwnd_message_handler_delegate.h ui/views/win/hwnd_message_handler_delegate.h
index 14021805..c4843c8 100644
--- ui/views/win/hwnd_message_handler_delegate.h
+++ ui/views/win/hwnd_message_handler_delegate.h
@@ -59,6 +59,10 @@ class VIEWS_EXPORT HWNDMessageHandlerDelegate {
   virtual bool CanMinimize() const = 0;
   virtual bool CanActivate() const = 0;
 
+  // Returns true if the system default caption and icon should not be rendered
+  // but the window may still have a resizable border.
+  virtual bool RemoveCaption() const = 0;
+
   // Returns true if the delegate wants mouse events when inactive and the
   // window is clicked and should not become activated. A return value of false
   // indicates the mouse events will be dropped.