Debugging code to print layer tree

ui/gfx/compositor/compositor.gyp

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'target_defaults': {
     'sources/': [
@@ skipping 29 matching lines @@
         'compositor_export.h',
         'compositor_gl.cc',
         'compositor_gl.h',
         'compositor_cc.cc',
         'compositor_cc.h',
         'compositor_observer.h',
         'compositor_stub.cc',
         'compositor_switches.cc',
         'compositor_switches.h',
         'compositor_win.cc',
+        'debug_utils.cc',
+        'debug_utils.h',
         'layer.cc',
         'layer.h',
         'layer_animation_delegate.h',
         'layer_animation_element.cc',
         'layer_animation_element.h',
         'layer_animation_observer.h',
         'layer_animation_sequence.cc',
         'layer_animation_sequence.h',
         'layer_animator.cc',
         'layer_animator.h',
@@ skipping 133 matching lines @@
             'test_compositor.cc',
             'test_compositor.h',
             'test_texture.cc',
             'test_texture.h',
           ],
         }],
       ],
     },
   ],
 }