Adding support for VSyncProvider to the software drawing path

content/browser/aura/browser_compositor_output_surface.h

Index: content/browser/aura/browser_compositor_output_surface.h
diff --git a/content/browser/aura/browser_compositor_output_surface.h b/content/browser/aura/browser_compositor_output_surface.h
index f9ec3c8d9d5a9b2ea1a54e78a517e8b0d9f1532d..b62462ea11ea53a257e3d8d3daa58fa93d1500bd 100644
--- a/content/browser/aura/browser_compositor_output_surface.h
+++ b/content/browser/aura/browser_compositor_output_surface.h
@@ -12,6 +12,10 @@
 
 namespace base { class MessageLoopProxy; }
 
+namespace cc {
+class SoftwareOutputDevice;
+}
+
 namespace ui { class Compositor; }
 
 namespace content {
@@ -19,33 +23,38 @@ class ContextProviderCommandBuffer;
 class ReflectorImpl;
 class WebGraphicsContext3DCommandBufferImpl;
 
-// Adapts a WebGraphicsContext3DCommandBufferImpl into a
-// cc::OutputSurface that also handles vsync parameter updates
-// arriving from the GPU process.
 class BrowserCompositorOutputSurface
     : public cc::OutputSurface,
       public base::NonThreadSafe {
  public:
-  BrowserCompositorOutputSurface(
-      const scoped_refptr<ContextProviderCommandBuffer>& context,
-      int surface_id,
-      IDMap<BrowserCompositorOutputSurface>* output_surface_map,
-      base::MessageLoopProxy* compositor_message_loop,
-      base::WeakPtr<ui::Compositor> compositor);
-
   virtual ~BrowserCompositorOutputSurface();
 
   // cc::OutputSurface implementation.
   virtual bool BindToClient(cc::OutputSurfaceClient* client) OVERRIDE;
   virtual void Reshape(gfx::Size size, float scale_factor) OVERRIDE;
-  virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
 
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval);
 
   void SetReflector(ReflectorImpl* reflector);
 
- private:
+ protected:
+  // Constructor used by the accelerated implementation.
+  BrowserCompositorOutputSurface(
+      const scoped_refptr<ContextProviderCommandBuffer>& context,
+      int surface_id,
+      IDMap<BrowserCompositorOutputSurface>* output_surface_map,
+      base::MessageLoopProxy* compositor_message_loop,
+      base::WeakPtr<ui::Compositor> compositor);
+
+  // Constructor used by the software implementation.
+  BrowserCompositorOutputSurface(
+      scoped_ptr<cc::SoftwareOutputDevice> software_device,
+      int surface_id,
+      IDMap<BrowserCompositorOutputSurface>* output_surface_map,
+      base::MessageLoopProxy* compositor_message_loop,
+      base::WeakPtr<ui::Compositor> compositor);
+
   int surface_id_;
   IDMap<BrowserCompositorOutputSurface>* output_surface_map_;