Let DelegateFrameHost in Mac and Android use correct FrameSinkId during creation

content/browser/compositor/gpu_process_transport_factory.cc

Index: content/browser/compositor/gpu_process_transport_factory.cc
diff --git a/content/browser/compositor/gpu_process_transport_factory.cc b/content/browser/compositor/gpu_process_transport_factory.cc
index 8a0995a4c78a0a1f31be7143b6b29fa65c6355cd..baaa62c671e3e172a1889b22faaf7c1603aa3dfb 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -690,6 +690,7 @@ GpuProcessTransportFactory::GetContextFactoryPrivate() {
 }
 
 cc::FrameSinkId GpuProcessTransportFactory::AllocateFrameSinkId() {
+  // TODO(crbug.com/685777): Centralize allocation in one place.

[boliu, 2017/01/26 22:52:40]

I was expecting something like

Must be unique with RenderWidgetHostViewFoo FrameSinkId allocations.

And then in all the RWHV places, add that it must be unique with this, etc etc.

   return cc::FrameSinkId(0, next_sink_id_++);
 }