content/browser/renderer_host/media/media_stream_manager_unittest.cc - chromium/src - Git at Google

 // 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.

 #include <stddef.h>

 #include <string>

 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/media/media_stream_requester.h"
 #include "content/browser/renderer_host/media/media_stream_ui_proxy.h"
 #include "content/common/media/media_stream_options.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/fake_audio_log_factory.h"
 #include "media/base/media_switches.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"

 #if defined(USE_ALSA)
 #include "media/audio/alsa/audio_manager_alsa.h"
 #elif defined(OS_ANDROID)
 #include "media/audio/android/audio_manager_android.h"
 #elif defined(OS_MACOSX)
 #include "media/audio/mac/audio_manager_mac.h"
 #elif defined(OS_WIN)
 #include "media/audio/win/audio_manager_win.h"
 #else
 #include "media/audio/fake_audio_manager.h"
 #endif

 using testing::_;

 namespace content {

 #if defined(USE_ALSA)
 typedef media::AudioManagerAlsa AudioManagerPlatform;
 #elif defined(OS_MACOSX)
 typedef media::AudioManagerMac AudioManagerPlatform;
 #elif defined(OS_WIN)
 typedef media::AudioManagerWin AudioManagerPlatform;
 #elif defined(OS_ANDROID)
 typedef media::AudioManagerAndroid AudioManagerPlatform;
 #else
 typedef media::FakeAudioManager AudioManagerPlatform;
 #endif

 namespace {

 std::string ReturnMockSalt() {
   return std::string();
 }

 ResourceContext::SaltCallback GetMockSaltCallback() {
   return base::Bind(&ReturnMockSalt);
 }

 // This class mocks the audio manager and overrides the
 // GetAudioInputDeviceNames() method to ensure that we can run our tests on
 // the buildbots. media::AudioManagerBase
 class MockAudioManager : public AudioManagerPlatform {
  public:
   MockAudioManager()
       : AudioManagerPlatform(&fake_audio_log_factory_),
         num_output_devices_(2) {}
   ~MockAudioManager() override {}

   void GetAudioInputDeviceNames(
       media::AudioDeviceNames* device_names) override {
     DCHECK(device_names->empty());
     if (HasAudioInputDevices()) {
       AudioManagerBase::GetAudioInputDeviceNames(device_names);
     } else {
       device_names->push_back(media::AudioDeviceName("fake_device_name",
                                                      "fake_device_id"));
     }
   }

   void GetAudioOutputDeviceNames(
       media::AudioDeviceNames* device_names) override {
     DCHECK(device_names->empty());

     // AudioManagers add a default device when there is at least one real device
     if (num_output_devices_ > 0) {
       device_names->push_back(media::AudioDeviceName(
           "Default", AudioManagerBase::kDefaultDeviceId));
     }
     for (size_t i = 0; i < num_output_devices_; i++) {
       device_names->push_back(media::AudioDeviceName(
           std::string("fake_device_name_") + base::SizeTToString(i),
           std::string("fake_device_id_") + base::SizeTToString(i)));
     }
   }

   void SetNumAudioOutputDevices(size_t num_devices) {
     num_output_devices_ = num_devices;
   }

  private:
   media::FakeAudioLogFactory fake_audio_log_factory_;
   size_t num_output_devices_;
   DISALLOW_COPY_AND_ASSIGN(MockAudioManager);
 };

 class MockMediaStreamRequester : public MediaStreamRequester {
  public:
   MockMediaStreamRequester(base::RunLoop* run_loop, size_t num_expected_devices)
       : run_loop_(run_loop), num_expected_devices_(num_expected_devices) {}
   virtual ~MockMediaStreamRequester() {}

   // MediaStreamRequester implementation.
   MOCK_METHOD5(StreamGenerated,
                void(int render_frame_id,
                     int page_request_id,
                     const std::string& label,
                     const StreamDeviceInfoArray& audio_devices,
                     const StreamDeviceInfoArray& video_devices));
   MOCK_METHOD3(StreamGenerationFailed,
                void(int render_frame_id,
                     int page_request_id,
                     content::MediaStreamRequestResult result));
   MOCK_METHOD3(DeviceStopped,
                void(int render_frame_id,
                     const std::string& label,
                     const StreamDeviceInfo& device));
   void DevicesEnumerated(int render_frame_id,
                          int page_request_id,
                          const std::string& label,
                          const StreamDeviceInfoArray& devices) override {
     MockDevicesEnumerated(render_frame_id, page_request_id, label, devices);
     EXPECT_EQ(num_expected_devices_, devices.size());

     run_loop_->Quit();
   }
   MOCK_METHOD4(MockDevicesEnumerated,
                void(int render_frame_id,
                     int page_request_id,
                     const std::string& label,
                     const StreamDeviceInfoArray& devices));
   MOCK_METHOD4(DeviceOpened,
                void(int render_frame_id,
                     int page_request_id,
                     const std::string& label,
                     const StreamDeviceInfo& device_info));

  private:
   DISALLOW_COPY_AND_ASSIGN(MockMediaStreamRequester);
   base::RunLoop* run_loop_;
   size_t num_expected_devices_;
 };

 }  // namespace

 class MediaStreamManagerTest : public ::testing::Test {
  public:
   MediaStreamManagerTest()
       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
         task_runner_(base::ThreadTaskRunnerHandle::Get()) {
     // Create our own MediaStreamManager. Use fake devices to run on the bots.
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kUseFakeDeviceForMediaStream);
     audio_manager_.reset(new MockAudioManager());
     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
 }

   virtual ~MediaStreamManagerTest() {
   }

   MOCK_METHOD1(Response, void(int index));
   void ResponseCallback(int index,
                         const MediaStreamDevices& devices,
                         scoped_ptr<MediaStreamUIProxy> ui_proxy) {
     Response(index);
     task_runner_->PostTask(FROM_HERE, run_loop_.QuitClosure());
   }

  protected:
   std::string MakeMediaAccessRequest(int index) {
     const int render_process_id = 1;
     const int render_frame_id = 1;
     const int page_request_id = 1;
     const GURL security_origin;
     MediaStreamManager::MediaRequestResponseCallback callback =
         base::Bind(&MediaStreamManagerTest::ResponseCallback,
                    base::Unretained(this), index);
     StreamControls controls(true, true);
     return media_stream_manager_->MakeMediaAccessRequest(
         render_process_id, render_frame_id, page_request_id, controls,
         security_origin, callback);
   }

   scoped_ptr<MockAudioManager> audio_manager_;
   scoped_ptr<MediaStreamManager> media_stream_manager_;
   content::TestBrowserThreadBundle thread_bundle_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::RunLoop run_loop_;

  private:
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManagerTest);
 };

 TEST_F(MediaStreamManagerTest, MakeMediaAccessRequest) {
   MakeMediaAccessRequest(0);

   // Expecting the callback will be triggered and quit the test.
   EXPECT_CALL(*this, Response(0));
   run_loop_.Run();
 }

 TEST_F(MediaStreamManagerTest, MakeAndCancelMediaAccessRequest) {
   std::string label = MakeMediaAccessRequest(0);
   // No callback is expected.
   media_stream_manager_->CancelRequest(label);
   run_loop_.RunUntilIdle();
   media_stream_manager_->WillDestroyCurrentMessageLoop();
 }

 TEST_F(MediaStreamManagerTest, MakeMultipleRequests) {
   // First request.
   std::string label1 =  MakeMediaAccessRequest(0);

   // Second request.
   int render_process_id = 2;
   int render_frame_id = 2;
   int page_request_id = 2;
   GURL security_origin;
   StreamControls controls(true, true);
   MediaStreamManager::MediaRequestResponseCallback callback =
       base::Bind(&MediaStreamManagerTest::ResponseCallback,
                  base::Unretained(this), 1);
   std::string label2 = media_stream_manager_->MakeMediaAccessRequest(
       render_process_id, render_frame_id, page_request_id, controls,
       security_origin, callback);

   // Expecting the callbackS from requests will be triggered and quit the test.
   // Note, the callbacks might come in a different order depending on the
   // value of labels.
   EXPECT_CALL(*this, Response(0));
   EXPECT_CALL(*this, Response(1));
   run_loop_.Run();
 }

 TEST_F(MediaStreamManagerTest, MakeAndCancelMultipleRequests) {
   std::string label1 = MakeMediaAccessRequest(0);
   std::string label2 = MakeMediaAccessRequest(1);
   media_stream_manager_->CancelRequest(label1);

   // Expecting the callback from the second request will be triggered and
   // quit the test.
   EXPECT_CALL(*this, Response(1));
   run_loop_.Run();
 }

 TEST_F(MediaStreamManagerTest, DeviceID) {
   GURL security_origin("http://localhost");
   const std::string unique_default_id(
       media::AudioManagerBase::kDefaultDeviceId);
   const std::string hashed_default_id =
       MediaStreamManager::GetHMACForMediaDeviceID(
           GetMockSaltCallback(), security_origin, unique_default_id);
   EXPECT_TRUE(MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
       GetMockSaltCallback(), security_origin, hashed_default_id,
       unique_default_id));
   EXPECT_EQ(unique_default_id, hashed_default_id);

   const std::string unique_communications_id(
       media::AudioManagerBase::kCommunicationsDeviceId);
   const std::string hashed_communications_id =
       MediaStreamManager::GetHMACForMediaDeviceID(
           GetMockSaltCallback(), security_origin, unique_communications_id);
   EXPECT_TRUE(MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
       GetMockSaltCallback(), security_origin, hashed_communications_id,
       unique_communications_id));
   EXPECT_EQ(unique_communications_id, hashed_communications_id);

   const std::string unique_other_id("other-unique-id");
   const std::string hashed_other_id =
       MediaStreamManager::GetHMACForMediaDeviceID(
           GetMockSaltCallback(), security_origin, unique_other_id);
   EXPECT_TRUE(MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
       GetMockSaltCallback(), security_origin, hashed_other_id,
       unique_other_id));
   EXPECT_NE(unique_other_id, hashed_other_id);
   EXPECT_EQ(hashed_other_id.size(), 64U);
   for (const char& c : hashed_other_id)
     EXPECT_TRUE((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'));
 }

 TEST_F(MediaStreamManagerTest, EnumerationOutputDevices) {
   for (size_t num_devices = 0; num_devices < 3; num_devices++) {
     audio_manager_->SetNumAudioOutputDevices(num_devices);
     base::RunLoop run_loop;
     MockMediaStreamRequester requester(&run_loop,
                                        num_devices == 0 ? 0 : num_devices + 1);
     const int render_process_id = 1;
     const int render_frame_id = 1;
     const int page_request_id = 1;
     const GURL security_origin("http://localhost");
     EXPECT_CALL(requester,
                 MockDevicesEnumerated(render_frame_id, page_request_id, _, _));
     std::string label = media_stream_manager_->EnumerateDevices(
         &requester, render_process_id, render_frame_id, GetMockSaltCallback(),
         page_request_id, MEDIA_DEVICE_AUDIO_OUTPUT, security_origin);
     run_loop.Run();
     // CancelRequest is necessary for enumeration requests.
     media_stream_manager_->CancelRequest(label);
   }
 }

 }  // namespace content
	// 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.

	#include <stddef.h>

	#include <string>

	#include "base/bind.h"
	#include "base/command_line.h"
	#include "base/location.h"
	#include "base/macros.h"
	#include "base/run_loop.h"
	#include "base/single_thread_task_runner.h"
	#include "base/strings/string_number_conversions.h"
	#include "base/thread_task_runner_handle.h"
	#include "build/build_config.h"
	#include "content/browser/browser_thread_impl.h"
	#include "content/browser/renderer_host/media/media_stream_manager.h"
	#include "content/browser/renderer_host/media/media_stream_requester.h"
	#include "content/browser/renderer_host/media/media_stream_ui_proxy.h"
	#include "content/common/media/media_stream_options.h"
	#include "content/public/common/content_switches.h"
	#include "content/public/test/test_browser_thread_bundle.h"
	#include "media/audio/audio_manager_base.h"
	#include "media/audio/fake_audio_log_factory.h"
	#include "media/base/media_switches.h"
	#include "testing/gmock/include/gmock/gmock.h"
	#include "testing/gtest/include/gtest/gtest.h"

	#if defined(USE_ALSA)
	#include "media/audio/alsa/audio_manager_alsa.h"
	#elif defined(OS_ANDROID)
	#include "media/audio/android/audio_manager_android.h"
	#elif defined(OS_MACOSX)
	#include "media/audio/mac/audio_manager_mac.h"
	#elif defined(OS_WIN)
	#include "media/audio/win/audio_manager_win.h"
	#else
	#include "media/audio/fake_audio_manager.h"
	#endif

	using testing::_;

	namespace content {

	#if defined(USE_ALSA)
	typedef media::AudioManagerAlsa AudioManagerPlatform;
	#elif defined(OS_MACOSX)
	typedef media::AudioManagerMac AudioManagerPlatform;
	#elif defined(OS_WIN)
	typedef media::AudioManagerWin AudioManagerPlatform;
	#elif defined(OS_ANDROID)
	typedef media::AudioManagerAndroid AudioManagerPlatform;
	#else
	typedef media::FakeAudioManager AudioManagerPlatform;
	#endif

	namespace {

	std::string ReturnMockSalt() {
	return std::string();
	}

	ResourceContext::SaltCallback GetMockSaltCallback() {
	return base::Bind(&ReturnMockSalt);
	}

	// This class mocks the audio manager and overrides the
	// GetAudioInputDeviceNames() method to ensure that we can run our tests on
	// the buildbots. media::AudioManagerBase
	class MockAudioManager : public AudioManagerPlatform {
	public:
	MockAudioManager()
	: AudioManagerPlatform(&fake_audio_log_factory_),
	num_output_devices_(2) {}
	~MockAudioManager() override {}

	void GetAudioInputDeviceNames(
	media::AudioDeviceNames* device_names) override {
	DCHECK(device_names->empty());
	if (HasAudioInputDevices()) {
	AudioManagerBase::GetAudioInputDeviceNames(device_names);
	} else {
	device_names->push_back(media::AudioDeviceName("fake_device_name",
	"fake_device_id"));
	}
	}

	void GetAudioOutputDeviceNames(
	media::AudioDeviceNames* device_names) override {
	DCHECK(device_names->empty());

	// AudioManagers add a default device when there is at least one real device
	if (num_output_devices_ > 0) {
	device_names->push_back(media::AudioDeviceName(
	"Default", AudioManagerBase::kDefaultDeviceId));
	}
	for (size_t i = 0; i < num_output_devices_; i++) {
	device_names->push_back(media::AudioDeviceName(
	std::string("fake_device_name_") + base::SizeTToString(i),
	std::string("fake_device_id_") + base::SizeTToString(i)));
	}
	}

	void SetNumAudioOutputDevices(size_t num_devices) {
	num_output_devices_ = num_devices;
	}

	private:
	media::FakeAudioLogFactory fake_audio_log_factory_;
	size_t num_output_devices_;
	DISALLOW_COPY_AND_ASSIGN(MockAudioManager);
	};

	class MockMediaStreamRequester : public MediaStreamRequester {
	public:
	MockMediaStreamRequester(base::RunLoop* run_loop, size_t num_expected_devices)
	: run_loop_(run_loop), num_expected_devices_(num_expected_devices) {}
	virtual ~MockMediaStreamRequester() {}

	// MediaStreamRequester implementation.
	MOCK_METHOD5(StreamGenerated,
	void(int render_frame_id,
	int page_request_id,
	const std::string& label,
	const StreamDeviceInfoArray& audio_devices,
	const StreamDeviceInfoArray& video_devices));
	MOCK_METHOD3(StreamGenerationFailed,
	void(int render_frame_id,
	int page_request_id,
	content::MediaStreamRequestResult result));
	MOCK_METHOD3(DeviceStopped,
	void(int render_frame_id,
	const std::string& label,
	const StreamDeviceInfo& device));
	void DevicesEnumerated(int render_frame_id,
	int page_request_id,
	const std::string& label,
	const StreamDeviceInfoArray& devices) override {
	MockDevicesEnumerated(render_frame_id, page_request_id, label, devices);
	EXPECT_EQ(num_expected_devices_, devices.size());

	run_loop_->Quit();
	}
	MOCK_METHOD4(MockDevicesEnumerated,
	void(int render_frame_id,
	int page_request_id,
	const std::string& label,
	const StreamDeviceInfoArray& devices));
	MOCK_METHOD4(DeviceOpened,
	void(int render_frame_id,
	int page_request_id,
	const std::string& label,
	const StreamDeviceInfo& device_info));

	private:
	DISALLOW_COPY_AND_ASSIGN(MockMediaStreamRequester);
	base::RunLoop* run_loop_;
	size_t num_expected_devices_;
	};

	} // namespace

	class MediaStreamManagerTest : public ::testing::Test {
	public:
	MediaStreamManagerTest()
	: thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
	task_runner_(base::ThreadTaskRunnerHandle::Get()) {
	// Create our own MediaStreamManager. Use fake devices to run on the bots.
	base::CommandLine::ForCurrentProcess()->AppendSwitch(
	switches::kUseFakeDeviceForMediaStream);
	audio_manager_.reset(new MockAudioManager());
	media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
	}

	virtual ~MediaStreamManagerTest() {
	}

	MOCK_METHOD1(Response, void(int index));
	void ResponseCallback(int index,
	const MediaStreamDevices& devices,
	scoped_ptr<MediaStreamUIProxy> ui_proxy) {
	Response(index);
	task_runner_->PostTask(FROM_HERE, run_loop_.QuitClosure());
	}

	protected:
	std::string MakeMediaAccessRequest(int index) {
	const int render_process_id = 1;
	const int render_frame_id = 1;
	const int page_request_id = 1;
	const GURL security_origin;
	MediaStreamManager::MediaRequestResponseCallback callback =
	base::Bind(&MediaStreamManagerTest::ResponseCallback,
	base::Unretained(this), index);
	StreamControls controls(true, true);
	return media_stream_manager_->MakeMediaAccessRequest(
	render_process_id, render_frame_id, page_request_id, controls,
	security_origin, callback);
	}

	scoped_ptr<MockAudioManager> audio_manager_;
	scoped_ptr<MediaStreamManager> media_stream_manager_;
	content::TestBrowserThreadBundle thread_bundle_;
	scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
	base::RunLoop run_loop_;

	private:
	DISALLOW_COPY_AND_ASSIGN(MediaStreamManagerTest);
	};

	TEST_F(MediaStreamManagerTest, MakeMediaAccessRequest) {
	MakeMediaAccessRequest(0);

	// Expecting the callback will be triggered and quit the test.
	EXPECT_CALL(*this, Response(0));
	run_loop_.Run();
	}

	TEST_F(MediaStreamManagerTest, MakeAndCancelMediaAccessRequest) {
	std::string label = MakeMediaAccessRequest(0);
	// No callback is expected.
	media_stream_manager_->CancelRequest(label);
	run_loop_.RunUntilIdle();
	media_stream_manager_->WillDestroyCurrentMessageLoop();
	}

	TEST_F(MediaStreamManagerTest, MakeMultipleRequests) {
	// First request.
	std::string label1 = MakeMediaAccessRequest(0);

	// Second request.
	int render_process_id = 2;
	int render_frame_id = 2;
	int page_request_id = 2;
	GURL security_origin;
	StreamControls controls(true, true);
	MediaStreamManager::MediaRequestResponseCallback callback =
	base::Bind(&MediaStreamManagerTest::ResponseCallback,
	base::Unretained(this), 1);
	std::string label2 = media_stream_manager_->MakeMediaAccessRequest(
	render_process_id, render_frame_id, page_request_id, controls,
	security_origin, callback);

	// Expecting the callbackS from requests will be triggered and quit the test.
	// Note, the callbacks might come in a different order depending on the
	// value of labels.
	EXPECT_CALL(*this, Response(0));
	EXPECT_CALL(*this, Response(1));
	run_loop_.Run();
	}

	TEST_F(MediaStreamManagerTest, MakeAndCancelMultipleRequests) {
	std::string label1 = MakeMediaAccessRequest(0);
	std::string label2 = MakeMediaAccessRequest(1);
	media_stream_manager_->CancelRequest(label1);

	// Expecting the callback from the second request will be triggered and
	// quit the test.
	EXPECT_CALL(*this, Response(1));
	run_loop_.Run();
	}

	TEST_F(MediaStreamManagerTest, DeviceID) {
	GURL security_origin("http://localhost");
	const std::string unique_default_id(
	media::AudioManagerBase::kDefaultDeviceId);
	const std::string hashed_default_id =
	MediaStreamManager::GetHMACForMediaDeviceID(
	GetMockSaltCallback(), security_origin, unique_default_id);
	EXPECT_TRUE(MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
	GetMockSaltCallback(), security_origin, hashed_default_id,
	unique_default_id));
	EXPECT_EQ(unique_default_id, hashed_default_id);

	const std::string unique_communications_id(
	media::AudioManagerBase::kCommunicationsDeviceId);
	const std::string hashed_communications_id =
	MediaStreamManager::GetHMACForMediaDeviceID(
	GetMockSaltCallback(), security_origin, unique_communications_id);
	EXPECT_TRUE(MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
	GetMockSaltCallback(), security_origin, hashed_communications_id,
	unique_communications_id));
	EXPECT_EQ(unique_communications_id, hashed_communications_id);

	const std::string unique_other_id("other-unique-id");
	const std::string hashed_other_id =
	MediaStreamManager::GetHMACForMediaDeviceID(
	GetMockSaltCallback(), security_origin, unique_other_id);
	EXPECT_TRUE(MediaStreamManager::DoesMediaDeviceIDMatchHMAC(
	GetMockSaltCallback(), security_origin, hashed_other_id,
	unique_other_id));
	EXPECT_NE(unique_other_id, hashed_other_id);
	EXPECT_EQ(hashed_other_id.size(), 64U);
	for (const char& c : hashed_other_id)
	EXPECT_TRUE((c >= '0' && c <= '9') \|\| (c >= 'a' && c <= 'f'));
	}

	TEST_F(MediaStreamManagerTest, EnumerationOutputDevices) {
	for (size_t num_devices = 0; num_devices < 3; num_devices++) {
	audio_manager_->SetNumAudioOutputDevices(num_devices);
	base::RunLoop run_loop;
	MockMediaStreamRequester requester(&run_loop,
	num_devices == 0 ? 0 : num_devices + 1);
	const int render_process_id = 1;
	const int render_frame_id = 1;
	const int page_request_id = 1;
	const GURL security_origin("http://localhost");
	EXPECT_CALL(requester,
	MockDevicesEnumerated(render_frame_id, page_request_id, _, _));
	std::string label = media_stream_manager_->EnumerateDevices(
	&requester, render_process_id, render_frame_id, GetMockSaltCallback(),
	page_request_id, MEDIA_DEVICE_AUDIO_OUTPUT, security_origin);
	run_loop.Run();
	// CancelRequest is necessary for enumeration requests.
	media_stream_manager_->CancelRequest(label);
	}
	}

	} // namespace content