Implement more of chrome.serial on the Mojo SerialConnection.

extensions/extensions.gyp

 # Copyright 2013 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 777 matching lines @@
       # unit_tests target. They should be moved here, which may require some
       # refactoring (ExtensionsBrowserClient, TestingProfile, etc.).
       # http://crbug.com/348066
       'target_name': 'extensions_unittests',
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:test_support_base',
         '../content/content_shell_and_tests.gyp:test_support_content',
         '../device/serial/serial.gyp:device_serial',
+        '../device/serial/serial.gyp:device_serial_test_util',
         '../mojo/mojo_base.gyp:mojo_environment_chromium',
         '../mojo/mojo_base.gyp:mojo_cpp_bindings',
         '../mojo/mojo_base.gyp:mojo_js_bindings_lib',
         '../mojo/mojo_base.gyp:mojo_system_impl',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         'extensions_common',
         'extensions_renderer',
         'extensions_resources.gyp:extensions_resources',
         'extensions_shell_and_test_pak',
@@ skipping 44 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/api/cast_channel/cast_channel.proto' ],
       'variables': {
           'proto_in_dir': 'browser/api/cast_channel',
           'proto_out_dir': 'extensions/browser/api/cast_channel',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ]
 }