Update the nine patch layer to use UI resources

cc/resources/scoped_ui_resource.h

Index: cc/resources/scoped_ui_resource.h
diff --git a/cc/resources/scoped_ui_resource.h b/cc/resources/scoped_ui_resource.h
index 628d372c552f2707965b2011731dc3db4b0cc141..2790ecb90b8fcc0fdc75b38d00691844c51af85d 100644
--- a/cc/resources/scoped_ui_resource.h
+++ b/cc/resources/scoped_ui_resource.h
@@ -15,6 +15,12 @@ namespace cc {
 
 class LayerTreeHost;
 
+// ScopedUIResource creates an UIResource from a bitmap and a LayerTreeHost.
+// This class holds a pointer to the host so that when the instance goes out of
+// scope, the created resource is deleted.  On a GetBitmap call from the
+// UIResource manager, ScopeUIResource always returns the reference to the
+// initially given bitmap, regardless of whether the resquest was because of
+// lost resource or not.
 class CC_EXPORT ScopedUIResource : public UIResourceClient {
  public:
   static scoped_ptr<ScopedUIResource> Create(
@@ -22,10 +28,12 @@ class CC_EXPORT ScopedUIResource : public UIResourceClient {
       scoped_refptr<UIResourceBitmap> bitmap);
   virtual ~ScopedUIResource();
 
+  // UIResourceClient implementation.
   virtual scoped_refptr<UIResourceBitmap> GetBitmap(
       UIResourceId uid,
       bool resource_lost) OVERRIDE;
-  UIResourceId id() { return id_; }
+
+  UIResourceId id();
 
  protected:
   ScopedUIResource(LayerTreeHost* host, scoped_refptr<UIResourceBitmap> bitmap);