Implement aura::WindowPortMus::CreateCompositorFrameSink()

ui/aura/mus/window_tree_client.cc

Index: ui/aura/mus/window_tree_client.cc
diff --git a/ui/aura/mus/window_tree_client.cc b/ui/aura/mus/window_tree_client.cc
index 89481a1e81c78697e05993ded5a0e68043baa271..d73ad162c10d8ab9bd246116cca2d95f2487a30f 100644
--- a/ui/aura/mus/window_tree_client.cc
+++ b/ui/aura/mus/window_tree_client.cc
@@ -700,6 +700,12 @@ void WindowTreeClient::ScheduleInFlightBoundsChange(
       window->window_mus_type() == WindowMusType::DISPLAY_MANUALLY_CREATED) {
     local_surface_id = window->GetOrAllocateLocalSurfaceId(new_bounds.size());
     synchronizing_with_child_on_next_frame_ = true;
+  } else if (window->window_mus_type() == WindowMusType::LOCAL) {

[Fady Samuel, 2017/06/07 20:36:11]

if it has a CompositorFrameSink then do this...

[Peng, 2017/06/07 21:14:29]

Done.

+    auto id = window->GetOrAllocateLocalSurfaceId(new_bounds.size());
+    if (id.is_valid()) {
+      local_surface_id = id;
+      synchronizing_with_child_on_next_frame_ = true;
+    }
   }
   tree_->SetWindowBounds(change_id, window->server_id(), new_bounds,
                          local_surface_id);
@@ -1412,12 +1418,6 @@ void WindowTreeClient::OnWindowSurfaceChanged(
   WindowMus* window = GetWindowByServerId(window_id);
   if (!window)
     return;
-
-  // If the parent is informed of a child's surface then that surface ID is
-  // guaranteed to be available in the display compositor so we set it as the
-  // fallback. If surface synchronization is enabled, the primary SurfaceInfo
-  // is created by the embedder, and the LocalSurfaceId is allocated by the
-  // embedder.
   window->SetFallbackSurfaceInfo(surface_info);
 }