Compositing Layer update for OffscreenCanvas resize

third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom

Index: third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
diff --git a/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom b/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
index f4e4448d561060e6fd9d53c0f2bae50a8f2d5c4e..6c7346d7b9de9f9c7e514c5107232a812adf0769 100644
--- a/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
+++ b/third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom
@@ -9,12 +9,17 @@ import "cc/ipc/mojo_compositor_frame_sink.mojom";
 import "cc/ipc/surface_id.mojom";
 import "cc/ipc/surface_sequence.mojom";
 
+interface OffscreenCanvasSurfaceClient {
+  OnSurfaceSizeChanged(cc.mojom.SurfaceId new_surface_id,
+                      uint32 width, uint32 height);
+};
+
 interface OffscreenCanvasSurface {
   // TODO(619138): Make creation of surface id Async after implementation
   // change on surface_id generator that makes client side be able to generate
   // unique surface_id.id_namespace alone.
   [Sync]
-  GetSurfaceId() => (cc.mojom.SurfaceId surface_id);
+  GetSurfaceId(OffscreenCanvasSurfaceClient client) => (cc.mojom.SurfaceId surface_id);
 
   Require(cc.mojom.SurfaceId surface_id, cc.mojom.SurfaceSequence sequence);
   Satisfy(cc.mojom.SurfaceSequence sequence);