cc: Add UniqueNotifier to cc/base.

cc/cc.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 69 matching lines @@
         'base/scoped_ptr_algorithm.h',
         'base/scoped_ptr_deque.h',
         'base/scoped_ptr_vector.h',
         'base/swap_promise.h',
         'base/swap_promise_monitor.cc',
         'base/swap_promise_monitor.h',
         'base/switches.cc',
         'base/switches.h',
         'base/tiling_data.cc',
         'base/tiling_data.h',
+        'base/unique_notifier.cc',
+        'base/unique_notifier.h',
         'base/util.h',
         'debug/benchmark_instrumentation.cc',
         'debug/benchmark_instrumentation.h',
         'debug/debug_colors.cc',
         'debug/debug_colors.h',
         'debug/debug_rect_history.cc',
         'debug/debug_rect_history.h',
         'debug/devtools_instrumentation.h',
         'debug/frame_rate_counter.cc',
         'debug/frame_rate_counter.h',
@@ skipping 390 matching lines @@
         'surfaces/surface.h',
         'surfaces/surface_aggregator.cc',
         'surfaces/surface_aggregator.h',
         'surfaces/surface_manager.cc',
         'surfaces/surface_manager.h',
         'surfaces/surfaces_export.h',
       ],
     },
   ],
 }