Update the nine patch layer to use UI resources

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 9956f4c7359887d8c3fa44f720f6c7177abf780d..10ca20c749336ecb29278ec4ee8cd064077f9537 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -1155,6 +1155,23 @@ void LayerTreeHost::DeleteUIResource(UIResourceId uid) {
   ui_resource_client_map_.erase(uid);
 }
 
+// Deletes a UI resource.  May safely be called more than once.

[danakj, 2013/08/27 15:42:48]

Remove this?

[powei, 2013/08/27 22:39:28]

Done.

+gfx::Size LayerTreeHost::GetUIResourceSize(UIResourceId uid) {
+  UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);

[danakj, 2013/08/27 15:42:48]

nit: s/iter/it/

[powei, 2013/08/27 22:39:28]

Done.

+  if (iter == ui_resource_client_map_.end())
+    return gfx::Size();
+
+  DCHECK(iter->second);
+
+  bool resource_lost = false;
+  scoped_refptr<UIResourceBitmap> bitmap =
+      iter->second->GetBitmap(uid, resource_lost);

[danakj, 2013/08/27 15:42:48]

can you use a local variable const& or non-const& of the it->second value so we
can see it's type explicitly here?

[powei, 2013/08/27 22:39:28]

Done.

+
+  DCHECK(bitmap.get());
+
+  return bitmap->GetSize();
+}
+
 void LayerTreeHost::UIResourceLost(UIResourceId uid) {
   UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);
   if (iter == ui_resource_client_map_.end())