Add API Key parsing for experimental APIs

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 235 matching lines @@
       'common/discardable_shared_memory_heap.h',
       'common/dom_storage/dom_storage_map.cc',
       'common/dom_storage/dom_storage_map.h',
       'common/dom_storage/dom_storage_messages.h',
       'common/drag_event_source_info.h',
       'common/drag_messages.h',
       'common/drag_traits.h',
       'common/dwrite_font_platform_win.cc',
       'common/dwrite_font_proxy_messages.h',
       'common/edit_command.h',
+      'common/experiments/api_key.cc',
+      'common/experiments/api_key.h',
       'common/file_utilities_messages.h',
       'common/fileapi/file_system_messages.h',
       'common/fileapi/webblob_messages.h',
       'common/font_cache_dispatcher_win.cc',
       'common/font_cache_dispatcher_win.h',
       'common/font_config_ipc_linux.cc',
       'common/font_config_ipc_linux.h',
       'common/font_list.cc',
       'common/font_list.h',
       'common/font_list_android.cc',
@@ skipping 842 matching lines @@
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.h',
       ],
     }],
   ],
 }