Drag-and-drop: Target drag messages to specific RenderWidgets.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index b465089cac08585f0e7eeae35bcc98734867228d..cfa6eb0b8347b22fdbbc974b36e8ded34acd678d 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -199,10 +199,8 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
                       const gfx::Point& client_pt,
                       const gfx::Point& screen_pt,
                       int key_modifiers) override;
-  void DragSourceEndedAt(int client_x,
-                         int client_y,
-                         int screen_x,
-                         int screen_y,
+  void DragSourceEndedAt(const gfx::Point& client_pt,
+                         const gfx::Point& screen_pt,
                          blink::WebDragOperation operation) override;
   void DragSourceSystemDragEnded() override;
   void FilterDropData(DropData* drop_data) override;
@@ -569,6 +567,10 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
 
   bool needs_begin_frames() const { return needs_begin_frames_; }
 
+  base::WeakPtr<RenderWidgetHostImpl> GetWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
  protected:
   // ---------------------------------------------------------------------------
   // The following method is overridden by RenderViewHost to send upwards to