fallback to null sink in WebAudioSourceProvider::Initialize() + UMA stats for device status

content/renderer/media/html_audio_element_capturer_source_unittest.cc

 // Copyright 2016 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.
 
 #include "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/media/html_audio_element_capturer_source.h"
 #include "content/renderer/media/media_stream_audio_track.h"
 #include "media/audio/null_audio_sink.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/fake_audio_render_callback.h"
+#include "media/base/media_log.h"
 #include "media/blink/webaudiosourceprovider_impl.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebHeap.h"
 
 using ::testing::_;
 using ::testing::AllOf;
 using ::testing::InSequence;
 using ::testing::Mock;
@@ skipping 35 matching lines @@
 //  test, and a WebMediaStreamAudioTrack, that the class under test needs to
 //  connect to in order to operate correctly. This class has an inner content
 //  MediaStreamAudioTrack.
 // - finally, a MockMediaStreamAudioSink to observe captured audio frames, and
 //  that plugs into the former MediaStreamAudioTrack.
 class HTMLAudioElementCapturerSourceTest : public testing::Test {
  public:
   HTMLAudioElementCapturerSourceTest()
       : fake_callback_(0.1),
         audio_source_(new media::WebAudioSourceProviderImpl(
-            new media::NullAudioSink(base::ThreadTaskRunnerHandle::Get()))) {}
+            new media::NullAudioSink(base::ThreadTaskRunnerHandle::Get()),
+            new media::MediaLog())) {}
 
   void SetUp() final {
     const media::AudioParameters params(
         media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
         media::GuessChannelLayout(kNumChannelsForTest),
         kAudioTrackSampleRate /* sample_rate */, 16 /* bits_per_sample */,
         kAudioTrackSamplesPerBuffer /* frames_per_buffer */);
     audio_source_->Initialize(params, &fake_callback_);
 
     blink_audio_source_.initialize(blink::WebString::fromUTF8("audio_id"),
@@ skipping 65 matching lines @@
   std::unique_ptr<media::AudioBus> bus = media::AudioBus::Create(
       kNumChannelsForTest, kAudioTrackSamplesPerBuffer);
   InjectAudio(bus.get());
   run_loop.Run();
 
   track()->Stop();
   track()->RemoveSink(&sink);
 }
 
 }  // namespace content