cc: Fix IOSurfaceLayer freezing during aborts

cc/layers/io_surface_layer.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/io_surface_layer.h"
 
 #include "cc/layers/io_surface_layer_impl.h"
 
 namespace cc {
 
@@ skipping 22 matching lines @@
 }
 
 void IOSurfaceLayer::PushPropertiesTo(LayerImpl* layer) {
   Layer::PushPropertiesTo(layer);
 
   IOSurfaceLayerImpl* io_surface_layer =
       static_cast<IOSurfaceLayerImpl*>(layer);
   io_surface_layer->SetIOSurfaceProperties(io_surface_id_, io_surface_size_);
 }
 
+bool IOSurfaceLayer::Update(ResourceUpdateQueue* queue,
+                            const OcclusionTracker* occlusion) {
+  bool updated = Layer::Update(queue, occlusion);
+
+  // This layer doesn't update any resources from the main thread side,
+  // but repaint rects need to be sent to the layer impl via commit.
+  return updated || !update_rect_.IsEmpty();
+}
+
 }  // namespace cc