Add autoresize capability to chromium.

content/browser/renderer_host/render_widget_host.h

Index: content/browser/renderer_host/render_widget_host.h
diff --git a/content/browser/renderer_host/render_widget_host.h b/content/browser/renderer_host/render_widget_host.h
index 03d8426e52a1e4237c33b1cb7c1cc555ef6daf17..3fa66599a66068623dfa6e2e9c69c5ad6e25d99e 100644
--- a/content/browser/renderer_host/render_widget_host.h
+++ b/content/browser/renderer_host/render_widget_host.h
@@ -495,6 +495,9 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
   virtual void NotifyRendererUnresponsive() {}
   virtual void NotifyRendererResponsive() {}
 
+  // Called when auto-size resulted in the render size changing.
+  virtual void OnRenderSizeChanged(const gfx::Size& size) {}
+
   // ---------------------------------------------------------------------------
 
   // RenderViewHost overrides this method to impose further restrictions on when
@@ -509,6 +512,10 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
   // RenderViewHost overrides this method to report when in fullscreen mode.
   virtual bool IsFullscreen() const;
 
+  // Indicates if the render widget host should track the render widget's size
+  // as opposed to visa versa.
+  void setShouldAutoSize(bool enable);
+
  protected:
   // true if a renderer has once been valid. We use this flag to display a sad
   // tab only when we lose our renderer and not if a paint occurs during
@@ -673,6 +680,10 @@ class CONTENT_EXPORT RenderWidgetHost : public IPC::Channel::Listener,
   // hand is updated when the resize message is sent.
   gfx::Rect in_flight_reserved_rect_;
 
+  // True if the render widget host should track the render widget's size as
+  // opposed to visa versa.
+  bool should_auto_size_;
+
   // True if a mouse move event was sent to the render view and we are waiting
   // for a corresponding ViewHostMsg_HandleInputEvent_ACK message.
   bool mouse_move_pending_;