[DevTools] Add stubs for Emulation domain.

content/content_browser.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_static',
     '../crypto/crypto.gyp:crypto',
     '../device/vibration/vibration.gyp:device_vibration',
     '../device/vibration/vibration.gyp:device_vibration_mojo_bindings',
@@ skipping 497 matching lines @@
       'browser/devtools/ipc_devtools_agent_host.cc',
       'browser/devtools/ipc_devtools_agent_host.h',
       'browser/devtools/protocol/color_picker.cc',
       'browser/devtools/protocol/color_picker.h',
       'browser/devtools/protocol/devtools_protocol_client.cc',
       'browser/devtools/protocol/devtools_protocol_client.h',
       'browser/devtools/protocol/devtools_protocol_handler.cc',
       'browser/devtools/protocol/devtools_protocol_handler.h',
       'browser/devtools/protocol/dom_handler.cc',
       'browser/devtools/protocol/dom_handler.h',
+      'browser/devtools/protocol/emulation_handler.cc',
+      'browser/devtools/protocol/emulation_handler.h',
       'browser/devtools/protocol/frame_recorder.cc',
       'browser/devtools/protocol/frame_recorder.h',
       'browser/devtools/protocol/input_handler.cc',
       'browser/devtools/protocol/input_handler.h',
       'browser/devtools/protocol/inspector_handler.cc',
       'browser/devtools/protocol/inspector_handler.h',
       'browser/devtools/protocol/network_handler.cc',
       'browser/devtools/protocol/network_handler.h',
       'browser/devtools/protocol/page_handler.cc',
       'browser/devtools/protocol/page_handler.h',
@@ skipping 1469 matching lines @@
         'browser/media/media_web_contents_observer.h',
       ],
     }],
     ['OS == "linux" and use_openssl==1', {
       'dependencies': [
         '../third_party/boringssl/boringssl.gyp:boringssl',
       ],
     }],
   ],
 }