cc: nine patch: add occlusion support

cc/layers/nine_patch_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/nine_patch_layer.h"
 
 #include "base/trace_event/trace_event.h"
 #include "cc/layers/nine_patch_layer_impl.h"
 #include "cc/resources/scoped_ui_resource.h"
 #include "cc/resources/ui_resource_bitmap.h"
@@ skipping 39 matching lines @@
 }
 
 void NinePatchLayer::SetNearestNeighbor(bool nearest_neighbor) {
   if (nearest_neighbor_ == nearest_neighbor)
     return;
 
   nearest_neighbor_ = nearest_neighbor;
   SetNeedsCommit();
 }
 
+void NinePatchLayer::SetLayerOcclusion(const gfx::Rect& occlusion) {
+  if (layer_occlusion_ == occlusion)
+    return;
+
+  layer_occlusion_ = occlusion;
+  SetNeedsCommit();
+}
+
 void NinePatchLayer::PushPropertiesTo(LayerImpl* layer) {
   UIResourceLayer::PushPropertiesTo(layer);
   TRACE_EVENT0("cc", "NinePatchLayer::PushPropertiesTo");
   NinePatchLayerImpl* layer_impl = static_cast<NinePatchLayerImpl*>(layer);
 
   if (!ui_resource_holder_) {
     layer_impl->SetUIResourceId(0);
   } else {
     DCHECK(layer_tree_host());
 
     layer_impl->SetLayout(image_aperture_, border_, fill_center_,
-                          nearest_neighbor_);
+                          nearest_neighbor_, layer_occlusion_);
   }
 }
 
 }  // namespace cc