Add the WebRTC.webkitApiCountPerSession metric.

content/content_renderer.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': [
     '../gin/gin.gyp:gin',
     '../jingle/jingle.gyp:jingle_glue',
     '../media/media.gyp:media',
     '../net/net.gyp:net',
@@ skipping 717 matching lines @@
         'renderer/media/webrtc_identity_service.cc',
         'renderer/media/webrtc_identity_service.h',
         'renderer/media/webrtc_local_audio_renderer.cc',
         'renderer/media/webrtc_local_audio_renderer.h',
         'renderer/media/webrtc_local_audio_source_provider.cc',
         'renderer/media/webrtc_local_audio_source_provider.h',
         'renderer/media/webrtc_local_audio_track.cc',
         'renderer/media/webrtc_local_audio_track.h',
         'renderer/media/webrtc_logging.cc',
         'renderer/media/webrtc_logging.h',
+        'renderer/media/webrtc_uma_histograms.cc',
+        'renderer/media/webrtc_uma_histograms.h',
         'renderer/p2p/host_address_request.cc',
         'renderer/p2p/host_address_request.h',
         'renderer/p2p/ipc_network_manager.cc',
         'renderer/p2p/ipc_network_manager.h',
         'renderer/p2p/ipc_socket_factory.cc',
         'renderer/p2p/ipc_socket_factory.h',
         'renderer/p2p/network_list_observer.h',
         'renderer/p2p/port_allocator.cc',
         'renderer/p2p/port_allocator.h',
         'renderer/p2p/socket_client_impl.cc',
@@ skipping 44 matching lines @@
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }