cc: Move UI Resource management out of LayerTreeHost.

cc/trees/layer_tree_host_interface.h

Index: cc/trees/layer_tree_host_interface.h
diff --git a/cc/trees/layer_tree_host_interface.h b/cc/trees/layer_tree_host_interface.h
index 7308787b5ab10b1e31cc8ecbad4aba058a1c0c7f..860031c791c714d7a690d5614e6bb80ff0f67b32 100644
--- a/cc/trees/layer_tree_host_interface.h
+++ b/cc/trees/layer_tree_host_interface.h
@@ -27,6 +27,7 @@ class LayerTreeSettings;
 class OutputSurface;
 class SwapPromiseMonitor;
 class TaskRunnerProvider;
+class UIResourceManager;
 
 // TODO(khushalsagar): Will be renamed to LayerTreeHost.
 class CC_EXPORT LayerTreeHostInterface {
@@ -45,6 +46,10 @@ class CC_EXPORT LayerTreeHostInterface {
   virtual LayerTree* GetLayerTree() = 0;
   virtual const LayerTree* GetLayerTree() const = 0;
 
+  // Returns the UIResourceManager used to create UIResources for
+  // UIResourceLayers pushed to the LayerTree.
+  virtual UIResourceManager* GetUIResourceManager() const = 0;
+
   // Returns the TaskRunnerProvider used to access the main and compositor
   // thread task runners.
   virtual TaskRunnerProvider* GetTaskRunnerProvider() const = 0;