UMA log for audio_device Init and Start(Playout|Recording). Make Init return a more specific error …

webrtc/modules/audio_device/audio_device.gypi

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'targets': [
@@ skipping 71 matching lines @@
             # Don't link these into Chrome since they contain static data.
             'dummy/file_audio_device_factory.cc',
             'dummy/file_audio_device_factory.h',
           ],
         }],
         ['include_internal_audio_device==1', {
           'sources': [
             'audio_device_impl.cc',
             'audio_device_impl.h',
           ],
+          'dependencies': [
+            '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
+          ],
           'conditions': [
             ['OS=="android"', {
               'sources': [
                 'android/audio_device_template.h',
                 'android/audio_manager.cc',
                 'android/audio_manager.h',
                 'android/audio_record_jni.cc',
                 'android/audio_record_jni.h',
                 'android/audio_track_jni.cc',
                 'android/audio_track_jni.h',
@@ skipping 180 matching lines @@
             'test/audio_device_test_defines.h',
             'test/func_test_manager.cc',
             'test/func_test_manager.h',
           ],
         },
       ], # targets
     }], # include_tests==1 and OS!=ios
   ],
 }