Changed GpuVSyncProvider to implement gfx::VSyncProvider

gpu/ipc/service/gpu_command_buffer_stub.cc

Index: gpu/ipc/service/gpu_command_buffer_stub.cc
diff --git a/gpu/ipc/service/gpu_command_buffer_stub.cc b/gpu/ipc/service/gpu_command_buffer_stub.cc
index b05dfd5aec2268ac013687a2d673606fb05f0945..27459948098735512fe7f4b7585c5b7e8d71fa18 100644
--- a/gpu/ipc/service/gpu_command_buffer_stub.cc
+++ b/gpu/ipc/service/gpu_command_buffer_stub.cc
@@ -374,6 +374,14 @@ void GpuCommandBufferStub::UpdateVSyncParameters(base::TimeTicks timebase,
                                                      interval));
 }
 
+void GpuCommandBufferStub::AddFilter(IPC::MessageFilter* message_filter) {
+  return channel_->AddFilter(message_filter);
+}
+
+int32_t GpuCommandBufferStub::GetRouteID() const {
+  return route_id_;
+}
+
 bool GpuCommandBufferStub::IsScheduled() {
   return (!executor_.get() || executor_->scheduled());
 }