Implement TextureImageTransportSurface using texture mailbox

content/common/gpu/image_transport_surface.h

Index: content/common/gpu/image_transport_surface.h
diff --git a/content/common/gpu/image_transport_surface.h b/content/common/gpu/image_transport_surface.h
index 3a9849ee65dc5de79f957d293b6b8f2edca15425..cd15dbbdbed87af0117ad3fc5d442d4d272c81ab 100644
--- a/content/common/gpu/image_transport_surface.h
+++ b/content/common/gpu/image_transport_surface.h
@@ -63,8 +63,6 @@ class ImageTransportSurface {
   virtual void OnBufferPresented(uint32 sync_point) = 0;
   virtual void OnResizeViewACK() = 0;
   virtual void OnResize(gfx::Size size) = 0;
-  virtual void OnSetFrontSurfaceIsProtected(bool is_protected,
-                                            uint32 protection_state_id);
 
   // Creates the appropriate surface depending on the GL implementation.
   static scoped_refptr<gfx::GLSurface>
@@ -141,8 +139,6 @@ class ImageTransportHelper : public IPC::Listener {
   // IPC::Message handlers.
   void OnBufferPresented(uint32 sync_point);
   void OnResizeViewACK();
-  void OnSetFrontSurfaceIsProtected(bool is_protected,
-                                    uint32 protection_state_id);
 
   // Backbuffer resize callback.
   void Resize(gfx::Size size);