Optionally have MessagePort pass data as base::Value, part 1.

content/content_common.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 65 matching lines @@
       'public/common/injection_test_mac.h',
       'public/common/injection_test_win.h',
       'public/common/javascript_message_type.h',
       'public/common/main_function_params.h',
       'public/common/manifest.cc',
       'public/common/manifest.h',
       'public/common/media_stream_request.cc',
       'public/common/media_stream_request.h',
       'public/common/menu_item.cc',
       'public/common/menu_item.h',
+      'public/common/message_port_types.cc',
+      'public/common/message_port_types.h',
       'public/common/mojo_channel_switches.cc',
       'public/common/mojo_channel_switches.h',
       'public/common/navigator_connect_client.cc',
       'public/common/navigator_connect_client.h',
       'public/common/page_state.cc',
       'public/common/page_state.h',
       'public/common/page_type.h',
       'public/common/page_zoom.h',
       'public/common/pepper_plugin_info.cc',
       'public/common/pepper_plugin_info.h',
@@ skipping 941 matching lines @@
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_buffer.h',
       ],
     }],
   ],
 }