Adds an API for inserting fake devices to internals

third_party/WebKit/Source/modules/modules_idl_files.gni

 # Copyright 2016 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.
 
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 
 # The paths in this file are absolute since this file is imported and the
 # file lists must be valid from multple "current directories".
 
 bindings_modules_output_dir = "$bindings_output_dir/modules"
@@ skipping 616 matching lines @@
           "webusb/NavigatorUSB.idl",
         ],
         "abspath")
 
 modules_testing_dependency_idl_files =
     get_path_info(
         [
           "accessibility/testing/InternalsAccessibility.idl",
           "fetch/testing/InternalsFetch.idl",
           "fetch/testing/WorkerInternalsFetch.idl",
+          "mediastream/testing/InternalsMediaStream.idl",
           "navigatorcontentutils/testing/InternalsNavigatorContentUtils.idl",
           "peerconnection/testing/InternalsRTCCertificate.idl",
           "serviceworkers/testing/InternalsServiceWorker.idl",
           "speech/testing/InternalsSpeechSynthesis.idl",
           "vibration/testing/InternalsVibration.idl",
           "webaudio/testing/InternalsWebAudio.idl",
         ],
         "abspath")
 
 modules_definition_idl_files = modules_dictionary_idl_files + modules_idl_files
@@ skipping 301 matching lines @@
   "$blink_modules_output_dir/websockets/CloseEventInit.h",
   "$blink_modules_output_dir/webusb/USBConnectionEventInit.cpp",
   "$blink_modules_output_dir/webusb/USBConnectionEventInit.h",
   "$blink_modules_output_dir/webusb/USBControlTransferParameters.cpp",
   "$blink_modules_output_dir/webusb/USBControlTransferParameters.h",
   "$blink_modules_output_dir/webusb/USBDeviceFilter.cpp",
   "$blink_modules_output_dir/webusb/USBDeviceFilter.h",
   "$blink_modules_output_dir/webusb/USBDeviceRequestOptions.cpp",
   "$blink_modules_output_dir/webusb/USBDeviceRequestOptions.h",
 ]