Avoid unnecessary LocalSurfaceId allocation in RenderWidgetHostViewChildFrame/Guest

content/browser/frame_host/render_widget_host_view_child_frame.h

Index: content/browser/frame_host/render_widget_host_view_child_frame.h
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.h b/content/browser/frame_host/render_widget_host_view_child_frame.h
index 87e2de411f8bb3c0c998d4db2011a7d4718e2100..d0990c5257d486f575c7b035008aa7dfd3bdbb99 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.h
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.h
@@ -180,6 +180,8 @@ class CONTENT_EXPORT RenderWidgetHostViewChildFrame
 
   void UpdateViewportIntersection(const gfx::Rect& viewport_intersection);
 
+  bool has_frame() { return has_frame_; }
+
  protected:
   friend class RenderWidgetHostView;
   friend class RenderWidgetHostViewChildFrameTest;
@@ -188,9 +190,6 @@ class CONTENT_EXPORT RenderWidgetHostViewChildFrame
   explicit RenderWidgetHostViewChildFrame(RenderWidgetHost* widget);
   void Init();
 
-  virtual bool ShouldCreateNewSurfaceId(uint32_t compositor_frame_sink_id,
-                                        const cc::CompositorFrame& frame);
-
   void ProcessCompositorFrame(uint32_t compositor_frame_sink_id,
                               cc::CompositorFrame frame);
 
@@ -242,6 +241,8 @@ class CONTENT_EXPORT RenderWidgetHostViewChildFrame
   void CreateCompositorFrameSinkSupport();
   void ResetCompositorFrameSinkSupport();
 
+  virtual bool HasEmbedderChanged();
+
   using FrameSwappedCallbackList = std::deque<std::unique_ptr<base::Closure>>;
   // Since frame-drawn callbacks are "fire once", we use std::deque to make
   // it convenient to swap() when processing the list.
@@ -250,6 +251,8 @@ class CONTENT_EXPORT RenderWidgetHostViewChildFrame
   // The surface client ID of the parent RenderWidgetHostView.  0 if none.
   cc::FrameSinkId parent_frame_sink_id_;
 
+  bool has_frame_ = false;
+
   base::WeakPtrFactory<RenderWidgetHostViewChildFrame> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewChildFrame);
 };