Windows: Improvements to off-screen rendering support (issue #518).

- Implement support for transparency. Change the backing store to use Skia instead of GDI and to keep alpha values.
- Implement support for select popups. Requires a patch to Chromium (content_popups.patch).
- Implicitly disable accelerated compositing when using off-screen rendering.
- Introduce a new CefMouseEvent structure for representing mouse event information passed to CefBrowser methods.
- Merge cef_key_event_modifiers_t into cef_event_flags_t.
- Add a new argument to CefBrowser::Invalidate telling the browser whether to invalidate the select popup or the main view.
- Add a new cefclient "transparent-painting-enabled" command-line flag to test transparent off-screen rendering.
- Add a new cefclient "Transparency" test.
- Fix the cefclient off-screen rendering rotation effect to work even when the underlying web content is not updating.
- Add unit tests for transparent painting and select popups.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@979 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/render_widget_host_view_osr.h

@@ -10,7 +10,9 @@
 #include <vector>
 
 #include "include/cef_base.h"
+#include "include/cef_browser.h"
 
+#include "base/memory/weak_ptr.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 
 namespace content {
@@ -90,7 +92,7 @@ class CefRenderWidgetHostViewOSR : public content::RenderWidgetHostViewBase {
   virtual void CopyFromCompositingSurface(
       const gfx::Rect& src_subrect,
       const gfx::Size& dst_size,
-      const base::Callback<void(bool)>& callback,
+      const base::Callback<void(bool b)>& callback,
       skia::PlatformBitmap* output) OVERRIDE;
   virtual void OnAcceleratedCompositingStateChange() OVERRIDE;
   virtual void SetHasHorizontalScrollbar(
@@ -113,12 +115,31 @@ class CefRenderWidgetHostViewOSR : public content::RenderWidgetHostViewBase {
   virtual void SetClickthroughRegion(SkRegion* region) OVERRIDE;
 #endif
 
-  // CefRenderWidgetHostViewOSR methods
-  void Invalidate(const gfx::Rect& rect);
+  // RenderWidgetHostViewBase methods.
+  virtual void SetBackground(const SkBitmap& background) OVERRIDE;
+
+  void SendKeyEvent(const content::NativeWebKeyboardEvent& event);
+  void SendMouseEvent(const WebKit::WebMouseEvent& event);
+  void SendMouseWheelEvent(const WebKit::WebMouseWheelEvent& event);
+
+  void Invalidate(const gfx::Rect& rect,
+                  CefBrowserHost::PaintElementType type);
   void Paint(const std::vector<gfx::Rect>& copy_rects);
+  bool InstallTransparency();
+
+  void CancelWidget();
+  void NotifyShowWidget();
+  void NotifyHideWidget();
+  void NotifySizeWidget();
 
   CefRefPtr<CefBrowserHostImpl> get_browser_impl() const;
   void set_browser_impl(CefRefPtr<CefBrowserHostImpl> browser);
+  void set_popup_host_view(CefRenderWidgetHostViewOSR* popup_view);
+  void set_parent_host_view(CefRenderWidgetHostViewOSR* parent_view);
+
+  bool IsPopupWidget() const {
+    return popup_type_ != WebKit::WebPopupTypeNone;
+  }
 
  private:
   friend class CefWebContentsViewOSR;
@@ -126,16 +147,26 @@ class CefRenderWidgetHostViewOSR : public content::RenderWidgetHostViewBase {
   explicit CefRenderWidgetHostViewOSR(content::RenderWidgetHost* widget);
   virtual ~CefRenderWidgetHostViewOSR();
 
+  // After calling this function, object gets deleted
+  void ShutdownHost();
+
+  // Factory used to safely scope delayed calls to ShutdownHost().
+  base::WeakPtrFactory<CefRenderWidgetHostViewOSR> weak_factory_;
+
   // The associated Model.  While |this| is being Destroyed,
   // |render_widget_host_| is NULL and the Windows message loop is run one last
   // time. Message handlers must check for a NULL |render_widget_host_|.
   content::RenderWidgetHostImpl* render_widget_host_;
+  CefRenderWidgetHostViewOSR* parent_host_view_;
+  CefRenderWidgetHostViewOSR* popup_host_view_;
 
   CefRefPtr<CefBrowserHostImpl> browser_impl_;
 
   bool about_to_validate_and_paint_;
   std::vector<gfx::Rect> pending_update_rects_;
 
+  gfx::Rect popup_position_;
+
   DISALLOW_COPY_AND_ASSIGN(CefRenderWidgetHostViewOSR);
 };