cef/patch/patches/chrome_browser_dialogs_widget.patch

diff --git chrome/browser/ui/views/chrome_javascript_app_modal_view_factory_views.cc chrome/browser/ui/views/chrome_javascript_app_modal_view_factory_views.cc
index b169371e4d42f..509e4bda85b47 100644
--- chrome/browser/ui/views/chrome_javascript_app_modal_view_factory_views.cc
+++ chrome/browser/ui/views/chrome_javascript_app_modal_view_factory_views.cc
@@ -100,7 +100,7 @@ javascript_dialogs::AppModalDialogView* CreateViewsJavaScriptDialog(
   gfx::NativeWindow parent_window =
       controller->web_contents()->GetTopLevelNativeWindow();
 #if defined(USE_AURA)
-  if (!parent_window->GetRootWindow()) {
+  if (parent_window && !parent_window->GetRootWindow()) {
     // When we are part of a WebContents that isn't actually being displayed
     // on the screen, we can't actually attach to it.
     parent_window = nullptr;
diff --git components/constrained_window/constrained_window_views.cc components/constrained_window/constrained_window_views.cc
index b82cb011d2359..e224eef611704 100644
--- components/constrained_window/constrained_window_views.cc
+++ components/constrained_window/constrained_window_views.cc
@@ -102,10 +102,17 @@ class ModalDialogHostObserverViews : public ModalDialogHostObserver {
 gfx::Rect GetModalDialogBounds(views::Widget* widget,
                                web_modal::ModalDialogHost* dialog_host,
                                const gfx::Size& size) {
-  views::Widget* const host_widget =
-      views::Widget::GetWidgetForNativeView(dialog_host->GetHostView());
+  // |host_view| will be nullptr with CEF windowless rendering.
+  auto host_view = dialog_host->GetHostView();
+  views::Widget* host_widget =
+      host_view ? views::Widget::GetWidgetForNativeView(host_view) : nullptr;
+
+  // If the host view is not backed by a Views::Widget, just update the widget
+  // size. This can happen on MacViews under the Cocoa browser where the window
+  // modal dialogs are displayed as sheets, and their position is managed by a
+  // ConstrainedWindowSheetController instance.
   if (!host_widget) {
-    return gfx::Rect();
+    return gfx::Rect(dialog_host->GetDialogPosition(size), size);
   }
 
   gfx::Point position = dialog_host->GetDialogPosition(size);
@@ -114,43 +121,22 @@ gfx::Rect GetModalDialogBounds(views::Widget* widget,
   position.set_y(position.y() -
                  widget->non_client_view()->frame_view()->GetInsets().top());
 
-  gfx::Rect dialog_bounds(position, size);
-
   if (widget->is_top_level() && SupportsGlobalScreenCoordinates()) {
-    gfx::Rect dialog_screen_bounds =
-        dialog_bounds +
-        host_widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
-    const gfx::Rect host_screen_bounds = host_widget->GetWindowBoundsInScreen();
-
-    // TODO(crbug.com/40851111): The requested dialog bounds should never fall
-    // outside the bounds of the transient parent.
-    DCHECK(dialog_screen_bounds.Intersects(host_screen_bounds));
-
-    // Adjust the dialog bound to ensure it remains visible on the display.
-    const gfx::Rect display_work_area =
-        display::Screen::GetScreen()
-            ->GetDisplayNearestView(dialog_host->GetHostView())
-            .work_area();
-    if (!display_work_area.Contains(dialog_screen_bounds)) {
-      dialog_screen_bounds.AdjustToFit(display_work_area);
-    }
-
-    // For platforms that clip transient children to the viewport we must
-    // maximize its bounds on the display whilst keeping it within the host
-    // bounds to avoid viewport clipping.
-    // In the case that the host window bounds do not have sufficient overlap
-    // with the display, and the dialog cannot be shown in its entirety, this is
-    // a recoverable state as users are still able to reposition the host window
-    // back onto the display.
-    if (PlatformClipsChildrenToViewport() &&
-        !host_screen_bounds.Contains(dialog_screen_bounds)) {
-      dialog_screen_bounds.AdjustToFit(host_screen_bounds);
-    }
-
-    // Readjust the position of the dialog.
-    dialog_bounds.set_origin(dialog_screen_bounds.origin());
+    position += host_widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
+    // If the dialog extends partially off any display, clamp its position to
+    // be fully visible within that display. If the dialog doesn't intersect
+    // with any display clamp its position to be fully on the nearest display.
+    gfx::Rect display_rect = gfx::Rect(position, size);
+    const display::Display display =
+        display::Screen::GetScreen()->GetDisplayNearestView(
+            dialog_host->GetHostView());
+    const gfx::Rect work_area = display.work_area();
+    if (!work_area.Contains(display_rect))
+      display_rect.AdjustToFit(work_area);
+    position = display_rect.origin();
   }
-  return dialog_bounds;
+
+  return gfx::Rect(position, size);
 }
 
 void UpdateModalDialogPosition(views::Widget* widget,
@@ -161,15 +147,24 @@ void UpdateModalDialogPosition(views::Widget* widget,
     return;
   }
 
-  views::Widget* const host_widget =
-      views::Widget::GetWidgetForNativeView(dialog_host->GetHostView());
+  // |host_view| will be nullptr with CEF windowless rendering.
+  auto host_view = dialog_host->GetHostView();
+  views::Widget* host_widget =
+      host_view ? views::Widget::GetWidgetForNativeView(host_view) : nullptr;
 
   // If the host view is not backed by a Views::Widget, just update the widget
   // size. This can happen on MacViews under the Cocoa browser where the window
   // modal dialogs are displayed as sheets, and their position is managed by a
   // ConstrainedWindowSheetController instance.
   if (!host_widget) {
+#if BUILDFLAG(IS_MAC)
     widget->SetSize(size);
+#elif BUILDFLAG(IS_POSIX)
+    // Set the bounds here instead of relying on the default behavior of
+    // DesktopWindowTreeHostPlatform::CenterWindow which incorrectly centers
+    // the window on the screen.
+    widget->SetBounds(gfx::Rect(dialog_host->GetDialogPosition(size), size));
+#endif
     return;
   }
 
@@ -299,8 +294,13 @@ views::Widget* CreateBrowserModalDialogViews(views::DialogDelegate* dialog,
 
   gfx::NativeView parent_view =
       parent ? CurrentBrowserModalClient()->GetDialogHostView(parent) : nullptr;
+  // Use with CEF windowless rendering.
+  gfx::AcceleratedWidget parent_widget =
+      parent ? CurrentBrowserModalClient()->GetModalDialogHost(parent)->
+          GetAcceleratedWidget() : gfx::kNullAcceleratedWidget;
   views::Widget* widget =
-      views::DialogDelegate::CreateDialogWidget(dialog, nullptr, parent_view);
+      views::DialogDelegate::CreateDialogWidget(dialog, nullptr, parent_view,
+                                                parent_widget);
   widget->SetNativeWindowProperty(
       views::kWidgetIdentifierKey,
       const_cast<void*>(kConstrainedWindowWidgetIdentifier));
@@ -317,8 +317,7 @@ views::Widget* CreateBrowserModalDialogViews(views::DialogDelegate* dialog,
     return widget;
 
   ModalDialogHost* host =
-      parent ? CurrentBrowserModalClient()->GetModalDialogHost(parent)
-             : nullptr;
+      CurrentBrowserModalClient()->GetModalDialogHost(parent);
   if (host) {
     DCHECK_EQ(parent_view, host->GetHostView());
     std::unique_ptr<ModalDialogHostObserver> observer =
@@ -335,11 +334,17 @@ views::Widget* CreateBrowserModalDialogViews(views::DialogDelegate* dialog,
 
 views::Widget* ShowBrowserModal(std::unique_ptr<ui::DialogModel> dialog_model,
                                 gfx::NativeWindow parent) {
+  gfx::NativeView parent_view =
+      parent ? CurrentBrowserModalClient()->GetDialogHostView(parent) : nullptr;
+  // Use with CEF windowless rendering.
+  gfx::AcceleratedWidget parent_widget =
+      parent ? CurrentBrowserModalClient()->GetModalDialogHost(parent)->
+          GetAcceleratedWidget() : gfx::kNullAcceleratedWidget;
+
   // TODO(crbug.com/41493925): Remove will_use_custom_frame once native frame
   // dialogs support autosize.
   bool will_use_custom_frame = views::DialogDelegate::CanSupportCustomFrame(
-      parent ? CurrentBrowserModalClient()->GetDialogHostView(parent)
-             : nullptr);
+      parent_view, parent_widget);
   auto dialog = views::BubbleDialogModelHost::CreateModal(
       std::move(dialog_model), ui::mojom::ModalType::kWindow,
       will_use_custom_frame);
diff --git components/constrained_window/native_web_contents_modal_dialog_manager_views.cc components/constrained_window/native_web_contents_modal_dialog_manager_views.cc
index 2b495a8ab092c..01a28aca853d0 100644
--- components/constrained_window/native_web_contents_modal_dialog_manager_views.cc
+++ components/constrained_window/native_web_contents_modal_dialog_manager_views.cc
@@ -190,9 +190,20 @@ void NativeWebContentsModalDialogManagerViews::HostChanged(
   if (host_) {
     host_->AddObserver(this);
 
-    for (views::Widget* widget : observed_widgets_) {
-      views::Widget::ReparentNativeView(widget->GetNativeView(),
-                                        host_->GetHostView());
+    // |host_view| will be nullptr with CEF windowless rendering.
+    if (auto host_view = host_->GetHostView()) {
+      for (views::Widget* widget : observed_widgets_) {
+#if defined(USE_AURA)
+        auto widget_view = widget->GetNativeView();
+        // Don't reparent between different root windows. Doing so causes
+        // issues with layout of dialogs containing Chrome browsers.
+        if (host_view->GetRootWindow() == widget_view->GetRootWindow()) {
+          views::Widget::ReparentNativeView(widget_view, host_view);
+        }
+#else
+        views::Widget::ReparentNativeView(widget->GetNativeView(), host_view);
+#endif
+      }
     }
 
     OnPositionRequiresUpdate();
diff --git components/web_modal/modal_dialog_host.h components/web_modal/modal_dialog_host.h
index 51ed6bcf6b540..c6e1161140655 100644
--- components/web_modal/modal_dialog_host.h
+++ components/web_modal/modal_dialog_host.h
@@ -34,6 +34,10 @@ class WEB_MODAL_EXPORT ModalDialogHost {
 
   // Returns the view against which the dialog is positioned and parented.
   virtual gfx::NativeView GetHostView() const = 0;
+  // Returns the widget against which the dialog is positioned and parented.
+  // Used with CEF windowless rendering.
+  virtual gfx::AcceleratedWidget GetAcceleratedWidget() const {
+      return gfx::kNullAcceleratedWidget; }
   // Gets the position for the dialog in coordinates relative to the host view.
   virtual gfx::Point GetDialogPosition(const gfx::Size& size) = 0;
   // Returns whether a dialog currently about to be shown should be activated.
diff --git ui/views/window/dialog_delegate.cc ui/views/window/dialog_delegate.cc
index bc119f10f749e..d81c1ce4e786f 100644
--- ui/views/window/dialog_delegate.cc
+++ ui/views/window/dialog_delegate.cc
@@ -87,10 +87,12 @@ DialogDelegate::DialogDelegate() {
 // static
 Widget* DialogDelegate::CreateDialogWidget(WidgetDelegate* delegate,
                                            gfx::NativeWindow context,
-                                           gfx::NativeView parent) {
+                                           gfx::NativeView parent,
+                                           gfx::AcceleratedWidget parent_widget) {
   views::Widget* widget = new DialogWidget;
   views::Widget::InitParams params =
-      GetDialogWidgetInitParams(delegate, context, parent, gfx::Rect());
+      GetDialogWidgetInitParams(delegate, context, parent, gfx::Rect(),
+                                parent_widget);
   widget->Init(std::move(params));
   return widget;
 }
@@ -99,16 +101,18 @@ Widget* DialogDelegate::CreateDialogWidget(WidgetDelegate* delegate,
 Widget* DialogDelegate::CreateDialogWidget(
     std::unique_ptr<WidgetDelegate> delegate,
     gfx::NativeWindow context,
-    gfx::NativeView parent) {
-  return CreateDialogWidget(delegate.release(), context, parent);
+    gfx::NativeView parent,
+    gfx::AcceleratedWidget parent_widget) {
+  return CreateDialogWidget(delegate.release(), context, parent, parent_widget);
 }
 
 // static
-bool DialogDelegate::CanSupportCustomFrame(gfx::NativeView parent) {
+bool DialogDelegate::CanSupportCustomFrame(gfx::NativeView parent,
+                                           gfx::AcceleratedWidget parent_widget) {
 #if (BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)) && \
     BUILDFLAG(ENABLE_DESKTOP_AURA)
   // The new style doesn't support unparented dialogs on Linux desktop.
-  return parent != nullptr;
+  return parent != nullptr || parent_widget != gfx::kNullAcceleratedWidget;
 #else
   return true;
 #endif
@@ -119,7 +123,8 @@ Widget::InitParams DialogDelegate::GetDialogWidgetInitParams(
     WidgetDelegate* delegate,
     gfx::NativeWindow context,
     gfx::NativeView parent,
-    const gfx::Rect& bounds) {
+    const gfx::Rect& bounds,
+    gfx::AcceleratedWidget parent_widget) {
   DialogDelegate* dialog = delegate->AsDialogDelegate();
 
   views::Widget::InitParams params(
@@ -129,7 +134,7 @@ Widget::InitParams DialogDelegate::GetDialogWidgetInitParams(
   params.bounds = bounds;
 
   if (dialog)
-    dialog->params_.custom_frame &= CanSupportCustomFrame(parent);
+    dialog->params_.custom_frame &= CanSupportCustomFrame(parent, parent_widget);
 
   if (!dialog || dialog->use_custom_frame()) {
     params.opacity = Widget::InitParams::WindowOpacity::kTranslucent;
@@ -142,6 +147,7 @@ Widget::InitParams DialogDelegate::GetDialogWidgetInitParams(
   }
   params.context = context;
   params.parent = parent;
+  params.parent_widget = parent_widget;
 #if !BUILDFLAG(IS_APPLE)
   // Web-modal (ui::mojom::ModalType::kChild) dialogs with parents are marked as
   // child widgets to prevent top-level window behavior (independent movement,
diff --git ui/views/window/dialog_delegate.h ui/views/window/dialog_delegate.h
index d64117586a5c3..c37d7a59c134e 100644
--- ui/views/window/dialog_delegate.h
+++ ui/views/window/dialog_delegate.h
@@ -106,13 +106,18 @@ class VIEWS_EXPORT DialogDelegate : public WidgetDelegate {
   // your use case.
   static Widget* CreateDialogWidget(std::unique_ptr<WidgetDelegate> delegate,
                                     gfx::NativeWindow context,
-                                    gfx::NativeView parent);
+                                    gfx::NativeView parent,
+                                    gfx::AcceleratedWidget parent_widget =
+                                        gfx::kNullAcceleratedWidget);
   static Widget* CreateDialogWidget(WidgetDelegate* delegate,
                                     gfx::NativeWindow context,
-                                    gfx::NativeView parent);
+                                    gfx::NativeView parent,
+                                    gfx::AcceleratedWidget parent_widget =
+                                        gfx::kNullAcceleratedWidget);
 
   // Whether using custom dialog frame is supported for this dialog.
-  static bool CanSupportCustomFrame(gfx::NativeView parent);
+  static bool CanSupportCustomFrame(gfx::NativeView parent,
+                                    gfx::AcceleratedWidget parent_widget);
 
   // Returns the dialog widget InitParams for a given |context| or |parent|.
   // If |bounds| is not empty, used to initially place the dialog, otherwise
@@ -120,7 +125,9 @@ class VIEWS_EXPORT DialogDelegate : public WidgetDelegate {
   static Widget::InitParams GetDialogWidgetInitParams(WidgetDelegate* delegate,
                                                       gfx::NativeWindow context,
                                                       gfx::NativeView parent,
-                                                      const gfx::Rect& bounds);
+                                                      const gfx::Rect& bounds,
+                                                      gfx::AcceleratedWidget parent_widget =
+                                                          gfx::kNullAcceleratedWidget);
 
   // Returns a mask specifying which of the available DialogButtons are visible
   // for the dialog.