Changed GpuVSyncProvider to implement gfx::VSyncProvider

gpu/ipc/in_process_command_buffer.cc

Index: gpu/ipc/in_process_command_buffer.cc
diff --git a/gpu/ipc/in_process_command_buffer.cc b/gpu/ipc/in_process_command_buffer.cc
index cfdc87942affc0665f30e5b0143b059d7dc06596..a2ca15673ba964dec399f06e7a9da4b28f8a89ba 100644
--- a/gpu/ipc/in_process_command_buffer.cc
+++ b/gpu/ipc/in_process_command_buffer.cc
@@ -1065,6 +1065,15 @@ void InProcessCommandBuffer::UpdateVSyncParameters(base::TimeTicks timebase,
                  client_thread_weak_ptr_, timebase, interval));
 }
 
+void InProcessCommandBuffer::AddFilter(IPC::MessageFilter* message_filter) {
+  NOTREACHED();

[Fady Samuel, 2017/02/14 09:09:38]

This is used by Mus. Any reason not to update this too? Thanks!

[stanisc, 2017/02/14 19:56:13]

I am not sure GPU VSyncProvider could be used with mus. Take a look at
https://codereview.chromium.org/2626413002/diff/60001/content/browser/composi...
which is from a pending change that shows integration of this feature on the
compositor side. It specifically avoids turning GPU v-sync in the case of mus.
Whether or not this could be used with mus we should discuss.

+}
+
+int32_t InProcessCommandBuffer::GetRouteID() const {
+  NOTREACHED();

[Fady Samuel, 2017/02/14 09:09:38]

This is used by Mus. Any reason not to update this too? Thanks!

[stanisc, 2017/02/14 19:56:13]

See above.

+  return 0;
+}
+
 void InProcessCommandBuffer::DidSwapBuffersCompleteOnOriginThread(
     SwapBuffersCompleteParams params) {
 #if defined(OS_MACOSX)