Add API Key parsing for experimental APIs

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',
     '../components/url_formatter/url_formatter.gyp:url_formatter',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
@@ skipping 656 matching lines @@
       'browser/download/save_file_resource_handler.cc',
       'browser/download/save_file_resource_handler.h',
       'browser/download/save_item.cc',
       'browser/download/save_item.h',
       'browser/download/save_package.cc',
       'browser/download/save_package.h',
       'browser/download/save_types.cc',
       'browser/download/save_types.h',
       'browser/download/url_downloader.cc',
       'browser/download/url_downloader.h',
+      'browser/experiments/api_key.cc',
+      'browser/experiments/api_key.h',
       'browser/fileapi/blob_storage_host.cc',
       'browser/fileapi/blob_storage_host.h',
       'browser/fileapi/browser_file_system_helper.cc',
       'browser/fileapi/browser_file_system_helper.h',
       'browser/fileapi/chrome_blob_storage_context.cc',
       'browser/fileapi/chrome_blob_storage_context.h',
       'browser/fileapi/fileapi_message_filter.cc',
       'browser/fileapi/fileapi_message_filter.h',
       'browser/fileapi/upload_file_system_file_element_reader.cc',
       'browser/fileapi/upload_file_system_file_element_reader.h',
@@ skipping 1527 matching lines @@
     ['enable_webvr==1 and OS=="android"', {
       'sources': [
         'browser/vr/android/cardboard/cardboard_vr_device.cc',
         'browser/vr/android/cardboard/cardboard_vr_device.h',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.cc',
         'browser/vr/android/cardboard/cardboard_vr_device_provider.h',
       ],
     }],
   ],
 }