Splits debug_commands into aura and non-aura parts

ui/compositor/debug_utils.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_COMPOSITOR_DEBUG_UTILS_H_
 #define UI_COMPOSITOR_DEBUG_UTILS_H_
 
 #include "ui/compositor/compositor_export.h"
 
 namespace gfx {
 class Point;
 }
 
 namespace ui {
 
 class Layer;
 
 // Log the layer hierarchy. Mark layers which contain |mouse_location| with '*'.
 COMPOSITOR_EXPORT void PrintLayerHierarchy(const Layer* layer,
-                                           gfx::Point mouse_location);
+                                           const gfx::Point& mouse_location);
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_DEBUG_UTILS_H_