Progress towards fixing 77536

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index b6cf16e07308a9e3a0600e6544c7836029b22b59..63580c7358c09f901313c81a39be6fd740a16774 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -74,6 +74,13 @@ class RenderWidget : public IPC::Channel::Listener,
   // Creates a WebWidget based on the popup type.
   static WebKit::WebWidget* CreateWebWidget(RenderWidget* render_widget);
 
+  // The compositing surface assigned by the RenderWidgetHost
+  // (or RenderViewHost). Will be gfx::kNullPluginWindow if not assigned yet,
+  // in which case we should not create any GPU command buffers with it.
+  gfx::PluginWindowHandle compositing_surface() const {
+    return compositing_surface_;
+  }
+
   // The routing ID assigned by the RenderProcess. Will be MSG_ROUTING_NONE if
   // not yet assigned a view ID, in which case, the process MUST NOT send
   // messages with this ID to the parent.
@@ -144,7 +151,8 @@ class RenderWidget : public IPC::Channel::Listener,
               IPC::SyncMessage* create_widget_message);
 
   // Finishes creation of a pending view started with Init.
-  void CompleteInit(gfx::NativeViewId parent);
+  void CompleteInit(gfx::NativeViewId parent,
+                    gfx::PluginWindowHandle compositing_surface);
 
   // Paints the given rectangular region of the WebWidget into canvas (a
   // shared memory segment returned by AllocPaintBuf on Windows). The caller
@@ -169,7 +177,8 @@ class RenderWidget : public IPC::Channel::Listener,
 
   // RenderWidget IPC message handlers
   void OnClose();
-  void OnCreatingNewAck(gfx::NativeViewId parent);
+  void OnCreatingNewAck(gfx::NativeViewId parent,
+                        gfx::PluginWindowHandle compositing_surface);
   virtual void OnResize(const gfx::Size& new_size,
                         const gfx::Rect& resizer_rect);
   virtual void OnWasHidden();
@@ -367,6 +376,10 @@ class RenderWidget : public IPC::Channel::Listener,
   // compositor.
   bool is_accelerated_compositing_active_;
 
+  // Handle to a surface that is drawn to when accelerated compositing is
+  // active.
+  gfx::PluginWindowHandle compositing_surface_;
+
   base::Time animation_floor_time_;
   bool animation_update_pending_;
   bool animation_task_posted_;