Add SwapPromise support to LayerTreeHost and LayerTreeImpl

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 46 matching lines @@
         'base/invalidation_region.cc',
         'base/invalidation_region.h',
         'base/math_util.cc',
         'base/math_util.h',
         'base/ref_counted_managed.h',
         'base/region.cc',
         'base/region.h',
         'base/scoped_ptr_algorithm.h',
         'base/scoped_ptr_deque.h',
         'base/scoped_ptr_vector.h',
+        'base/swap_promise.h',
         'base/switches.cc',
         'base/switches.h',
         'base/tiling_data.cc',
         'base/tiling_data.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',
@@ skipping 354 matching lines @@
         'trees/thread_proxy.cc',
         'trees/thread_proxy.h',
         'trees/tree_synchronizer.cc',
         'trees/tree_synchronizer.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }