cc: nine patch: add occlusion support

cc/layers/nine_patch_layer.cc

Index: cc/layers/nine_patch_layer.cc
diff --git a/cc/layers/nine_patch_layer.cc b/cc/layers/nine_patch_layer.cc
index b68891cf51e3d44e1dcfcdda97003bbf90030163..84aaee542c47e7ce86d05ec9a73ca7eaa723d704 100644
--- a/cc/layers/nine_patch_layer.cc
+++ b/cc/layers/nine_patch_layer.cc
@@ -57,6 +57,14 @@ void NinePatchLayer::SetNearestNeighbor(bool 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");
@@ -67,8 +75,8 @@ void NinePatchLayer::PushPropertiesTo(LayerImpl* layer) {
   } else {
     DCHECK(layer_tree_host());
 
-    layer_impl->SetLayout(image_aperture_, border_, fill_center_,
-                          nearest_neighbor_);
+    layer_impl->SetLayout(image_aperture_, border_, layer_occlusion_,
+                          fill_center_, nearest_neighbor_);
   }
 }