GpuProcessHost: setup ipc to propagate supported GpuMemoryBufferAttribs

content/browser/gpu/gpu_process_host.h

Index: content/browser/gpu/gpu_process_host.h
diff --git a/content/browser/gpu/gpu_process_host.h b/content/browser/gpu/gpu_process_host.h
index 7b25454b7e93a7f81bccf3933fd9914ca903f770..422ef48a8a55b0abdac29a1887c70debcf461c26 100644
--- a/content/browser/gpu/gpu_process_host.h
+++ b/content/browser/gpu/gpu_process_host.h
@@ -87,6 +87,8 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
       base::Callback<void(const gfx::GpuMemoryBufferHandle& handle,
                           BufferCreationStatus status)>;
 
+  typedef base::Callback<void(const gfx::GpuMemoryBufferAttribVector&)>
+      GetGpuMemoryBufferAttribsCallback;
   static bool gpu_enabled() { return gpu_enabled_; }
   static int gpu_crash_count() { return gpu_crash_count_; }
 
@@ -147,6 +149,8 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
                               int client_id,
                               const gpu::SyncToken& sync_token);
 
+  void GetGpuMemoryBufferAttribs(
+      const GetGpuMemoryBufferAttribsCallback& callback);
 #if defined(OS_ANDROID)
   // Tells the GPU process that the given surface is being destroyed so that it
   // can stop using it.
@@ -206,7 +210,8 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
                             const EstablishChannelCallback& callback,
                             mojo::ScopedMessagePipeHandle channel_handle);
   void OnGpuMemoryBufferCreated(const gfx::GpuMemoryBufferHandle& handle);
-
+  void OnGpuMemoryBufferAttribsReceived(
+      const gfx::GpuMemoryBufferAttribVector& supported_attribs);
   // Message handlers.
 #if defined(OS_ANDROID)
   void OnDestroyingVideoSurfaceAck();
@@ -236,6 +241,10 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
   // The pending create gpu memory buffer requests we need to reply to.
   std::queue<CreateGpuMemoryBufferCallback> create_gpu_memory_buffer_requests_;
 
+  // The pending get attribs requests we need to reply to.
+  std::queue<GetGpuMemoryBufferAttribsCallback>
+      get_gpu_memory_buffer_attribs_requests_;
+
   // A callback to signal the completion of a SendDestroyingVideoSurface call.
   base::Closure send_destroying_video_surface_done_cb_;