cc: Fix IOSurfaceLayer freezing during aborts

cc/layers/io_surface_layer.cc

Index: cc/layers/io_surface_layer.cc
diff --git a/cc/layers/io_surface_layer.cc b/cc/layers/io_surface_layer.cc
index 3ccbdd9f22fe129850de3a27457dfb082e950050..1e945150a0c329eaf1e38900abe28307287fb6ba 100644
--- a/cc/layers/io_surface_layer.cc
+++ b/cc/layers/io_surface_layer.cc
@@ -40,4 +40,13 @@ void IOSurfaceLayer::PushPropertiesTo(LayerImpl* 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