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': [
     {
       'target_name': 'audio_device',
       'type': 'static_library',
       'dependencies': [
         'webrtc_utility',
         '<(webrtc_root)/base/base.gyp:rtc_base_approved',
         '<(webrtc_root)/common.gyp:webrtc_common',
         '<(webrtc_root)/common_audio/common_audio.gyp:common_audio',
-        '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
+        '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers_default',

[henrika_webrtc, 2016/06/30 08:44:20]

Why was this needed?

[Max Morin WebRTC, 2016/06/30 10:56:04]

For linking with metrics. I made the dependencies more precise in the new patch
set.

       ],
       'include_dirs': [
         '.',
         '../include',
         'include',
         'dummy',  # Contains dummy audio device implementations.
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../include',
@@ skipping 222 matching lines @@
     ['include_tests==1 and OS!="ios"', {
       'targets': [
         {
           'target_name': 'audio_device_tests',
           'type': 'executable',
           'dependencies': [
             'audio_device',
             'webrtc_utility',
             '<(webrtc_root)/test/test.gyp:test_support_main',
             '<(DEPTH)/testing/gtest.gyp:gtest',
-            '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
+            '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers_default',
           ],
           'sources': [
             'test/audio_device_test_api.cc',
             'test/audio_device_test_defines.h',
           ],
         },
         {
           'target_name': 'audio_device_test_func',
           'type': 'executable',
           'dependencies': [
             'audio_device',
             'webrtc_utility',
             '<(webrtc_root)/common_audio/common_audio.gyp:common_audio',
-            '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
+            '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers_default',
             '<(webrtc_root)/test/test.gyp:test_support',
             '<(DEPTH)/testing/gtest.gyp:gtest',
           ],
           'sources': [
             'test/audio_device_test_func.cc',
             'test/audio_device_test_defines.h',
             'test/func_test_manager.cc',
             'test/func_test_manager.h',
           ],
         },
       ], # targets
     }], # include_tests==1 and OS!=ios
   ],
 }