Move Mailbox from cc to gpu, and its traits to gpu/ipc

cc/cc_tests.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': 0,
     'cc_unit_tests_source_files': [
       'animation_unittest.cc',
       'content_layer_unittest.cc',
@@ skipping 126 matching lines @@
       'test/tiled_layer_test_common.cc',
       'test/tiled_layer_test_common.h',
     ],
   },
   'targets': [
     {
       'target_name': 'cc_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         '../base/base.gyp:test_support_base',
+        '../gpu/gpu.gyp:gpu',
         '../media/media.gyp:media',
         '../skia/skia.gyp:skia',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../ui/ui.gyp:ui',
         '../webkit/gpu/webkit_gpu.gyp:webkit_gpu',
         'cc.gyp:cc',
         'cc_test_support',
         'cc_test_utils',
       ],
@@ skipping 125 matching lines @@
           'variables': {
             'test_suite_name': 'cc_perftests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)cc_perftests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }]
   ],
 }