Mus-WS / Aura-Mus: Propagate LocalSurfaceId on WindowTreeHost creation

services/ui/public/interfaces/window_tree.mojom

Index: services/ui/public/interfaces/window_tree.mojom
diff --git a/services/ui/public/interfaces/window_tree.mojom b/services/ui/public/interfaces/window_tree.mojom
index 3d9a6db1bf74d5bbf2fac057750d8ec4a26c85a3..906b77e931c485273620b8eea28b659d67f74581 100644
--- a/services/ui/public/interfaces/window_tree.mojom
+++ b/services/ui/public/interfaces/window_tree.mojom
@@ -6,6 +6,7 @@ module ui.mojom;
 
 import "cc/ipc/frame_sink_id.mojom";
 import "cc/ipc/local_surface_id.mojom";
+import "cc/ipc/surface_id.mojom";
 import "cc/ipc/surface_info.mojom";
 import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "services/ui/public/interfaces/cursor.mojom";
@@ -335,7 +336,8 @@ interface WindowTreeClient {
           int64 display_id,
           uint32 focused_window,
           bool parent_drawn,
-          cc.mojom.FrameSinkId frame_sink_id);
+          cc.mojom.FrameSinkId frame_sink_id,
+          cc.mojom.LocalSurfaceId? local_surface_id);
 
   // Invoked when the application embedded at |window| is disconnected. In other
   // words the embedded app closes the connection to the server. This is called
@@ -364,7 +366,8 @@ interface WindowTreeClient {
                     WindowData data,
                     int64 display_id,
                     bool parent_drawn,
-                    cc.mojom.FrameSinkId frame_sink_id);
+                    cc.mojom.FrameSinkId frame_sink_id,
+                    cc.mojom.LocalSurfaceId? local_surface_id);
 
   // Invoked when a window's bounds have changed. Only the client embedded in
   // |window| gets a non_empty |local_surface_id|.