cc: Move UI Resource management out of LayerTreeHost.

cc/trees/layer_tree.h

Index: cc/trees/layer_tree.h
diff --git a/cc/trees/layer_tree.h b/cc/trees/layer_tree.h
index e731d4b1c9d900dddb3c53b791a39a2b4652b629..77d105c84d16bc81af816756b5673297f4be8db1 100644
--- a/cc/trees/layer_tree.h
+++ b/cc/trees/layer_tree.h
@@ -37,7 +37,9 @@ class HeadsUpDisplayLayer;
 class Layer;
 class LayerTreeHost;
 class LayerTreeImpl;
+class LayerTreeSettings;
 struct PendingPageScaleAnimation;
+class UIResourceManager;
 
 class CC_EXPORT LayerTree : public MutatorHostClient {
  public:
@@ -120,6 +122,9 @@ class CC_EXPORT LayerTree : public MutatorHostClient {
 
   void SetNeedsDisplayOnAllLayers();
 
+  UIResourceManager* GetUIResourceManager() const;
+  const LayerTreeSettings& GetSettings() const;
+
   // Methods which should only be used internally in cc ------------------
   void RegisterLayer(Layer* layer);
   void UnregisterLayer(Layer* layer);