cc: Glue LTHI and Scheduler changes for checker-imaging.

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 4661d9816cdb894fba47df14b1f6df27a3a9d6a5..6588d8fad9ce25c949d8bff060121201cd0dc792 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -478,6 +478,8 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
 
   base::WeakPtr<InputHandler> input_handler_weak_ptr_;
 
+  scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner_;
+
  private:
   friend class LayerTreeHostSerializationTest;
 
@@ -597,8 +599,6 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
 
   MutatorHost* mutator_host_;
 
-  scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner_;
-
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };