mus-ws: Plumb FrameSinkId to Children

content/renderer/mus/renderer_window_tree_client.h

Index: content/renderer/mus/renderer_window_tree_client.h
diff --git a/content/renderer/mus/renderer_window_tree_client.h b/content/renderer/mus/renderer_window_tree_client.h
index d94094d057fac98e538e3bc6e6f4469b2d425dbf..f44d9adceda0e12a7f313eef554aa4e444c40467 100644
--- a/content/renderer/mus/renderer_window_tree_client.h
+++ b/content/renderer/mus/renderer_window_tree_client.h
@@ -44,15 +44,22 @@ class RendererWindowTreeClient : public ui::mojom::WindowTreeClient {
 
   void Bind(ui::mojom::WindowTreeClientRequest request);
 
-  std::unique_ptr<cc::CompositorFrameSink> CreateCompositorFrameSink(
-      const cc::FrameSinkId& frame_sink_id,
+  using CompositorFrameSinkCallback =
+      base::Callback<void(std::unique_ptr<cc::CompositorFrameSink>)>;
+  void RequestCompositorFrameSink(
       scoped_refptr<cc::ContextProvider> context_provider,
-      gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager);
+      gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
+      const CompositorFrameSinkCallback& callback);
 
  private:
   explicit RendererWindowTreeClient(int routing_id);
   ~RendererWindowTreeClient() override;
 
+  void RequestCompositorFrameSinkInternal(
+      scoped_refptr<cc::ContextProvider> context_provider,
+      gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
+      const CompositorFrameSinkCallback& callback);
+
   void DestroySelf();
 
   // ui::mojom::WindowTreeClient:
@@ -65,7 +72,8 @@ class RendererWindowTreeClient : public ui::mojom::WindowTreeClient {
                ui::mojom::WindowTreePtr tree,
                int64_t display_id,
                ui::Id focused_window_id,
-               bool drawn) override;
+               bool drawn,
+               const cc::FrameSinkId& frame_sink_id) override;
   void OnEmbeddedAppDisconnected(ui::Id window_id) override;
   void OnUnembed(ui::Id window_id) override;
   void OnCaptureChanged(ui::Id new_capture_window_id,
@@ -73,7 +81,8 @@ class RendererWindowTreeClient : public ui::mojom::WindowTreeClient {
   void OnTopLevelCreated(uint32_t change_id,
                          ui::mojom::WindowDataPtr data,
                          int64_t display_id,
-                         bool drawn) override;
+                         bool drawn,
+                         const cc::FrameSinkId& frame_sink_id) override;
   void OnWindowBoundsChanged(
       ui::Id window_id,
       const gfx::Rect& old_bounds,
@@ -149,6 +158,8 @@ class RendererWindowTreeClient : public ui::mojom::WindowTreeClient {
 
   const int routing_id_;
   ui::Id root_window_id_;
+  cc::FrameSinkId frame_sink_id_;
+  base::Closure pending_compositor_frame_sink_request_;
   ui::mojom::WindowTreePtr tree_;
   std::unique_ptr<ui::ClientCompositorFrameSinkBinding> pending_frame_sink_;
   mojo::Binding<ui::mojom::WindowTreeClient> binding_;