WIP: Surface Synchronization System

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 51c1726c17a6b0d02e096c822f26836c7b746310..fd7e3b2cd41bdfc4897c002db5c501cc87ac6ecc 100644
--- a/services/ui/public/interfaces/window_tree.mojom
+++ b/services/ui/public/interfaces/window_tree.mojom
@@ -4,6 +4,7 @@
 
 module ui.mojom;
 
+import "cc/ipc/local_frame_id.mojom";
 import "cc/ipc/surface_info.mojom";
 import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "services/ui/public/interfaces/cursor.mojom";
@@ -53,7 +54,8 @@ interface WindowTree {
   //     match the connection id of the client.
   NewWindow(uint32 change_id,
             uint32 window_id,
-            map<string, array<uint8>>? properties);
+            map<string, array<uint8>>? properties,
+            cc.mojom.LocalFrameId local_frame_id);
 
   // Requests the WindowManager to create a new top level window. On success
   // OnTopLevelCreated() is called with the WindowData for the new window. On
@@ -100,8 +102,10 @@ interface WindowTree {
   // Stops the pointer watcher for all events.
   StopPointerWatcher();
 
-  // Sets the specified bounds of the specified window.
-  SetWindowBounds(uint32 change_id, uint32 window_id, gfx.mojom.Rect bounds);
+  // Sets the specified bounds of the specified window. The window will paint
+  // the frame in the provided |local_frame_id|.
+  SetWindowBounds(uint32 change_id, uint32 window_id, gfx.mojom.Rect bounds,
+                  cc.mojom.LocalFrameId local_frame_id);
 
   // Sets the client area of the specified window. The client area is specified
   // by way of insets. Everything outside of the insets, and not in
@@ -344,7 +348,8 @@ interface WindowTreeClient {
   // Invoked when a window's bounds have changed.
   OnWindowBoundsChanged(uint32 window,
                         gfx.mojom.Rect old_bounds,
-                        gfx.mojom.Rect new_bounds);
+                        gfx.mojom.Rect new_bounds,
+                        cc.mojom.LocalFrameId local_frame_id);
 
   OnClientAreaChanged(uint32 window_id,
                       gfx.mojom.Insets new_client_area,