Use ScopedTaskEnvironment instead of MessageLoopForUI in content tests.

content/renderer/media/webrtc/media_stream_video_webrtc_sink_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 "content/renderer/media/webrtc/media_stream_video_webrtc_sink.h"
 
 #include "base/test/scoped_feature_list.h"
+#include "base/test/scoped_task_environment.h"
 #include "content/child/child_process.h"
 #include "content/public/common/content_features.h"
 #include "content/renderer/media/mock_constraint_factory.h"
 #include "content/renderer/media/mock_media_stream_registry.h"
 #include "content/renderer/media/video_track_adapter.h"
 #include "content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 namespace {
 
 class MediaStreamVideoWebRtcSinkTest : public ::testing::Test {
  public:
-  MediaStreamVideoWebRtcSinkTest() {
+  MediaStreamVideoWebRtcSinkTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI) {
     scoped_feature_list_.InitAndDisableFeature(
         features::kMediaStreamOldVideoConstraints);
   }
 
   void SetVideoTrack() {
     registry_.Init("stream URL");
     registry_.AddVideoTrack("test video track");
     blink::WebVector<blink::WebMediaStreamTrack> video_tracks;
     registry_.test_stream().VideoTracks(video_tracks);
     track_ = video_tracks[0];
@@ skipping 23 matching lines @@
   }
 
  protected:
   blink::WebMediaStreamTrack track_;
   MockPeerConnectionDependencyFactory dependency_factory_;
 
  private:
   MockMediaStreamRegistry registry_;
   // A ChildProcess and a MessageLoopForUI are both needed to fool the Tracks
   // and Sources in |registry_| into believing they are on the right threads.
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   const ChildProcess child_process_;
   base::test::ScopedFeatureList scoped_feature_list_;
 };
 
 TEST_F(MediaStreamVideoWebRtcSinkTest, NoiseReductionDefaultsToNotSet) {
   SetVideoTrack();
   MediaStreamVideoWebRtcSink my_sink(track_, &dependency_factory_);
   EXPECT_TRUE(my_sink.webrtc_video_track());
   EXPECT_FALSE(my_sink.SourceNeedsDenoisingForTesting());
 }
 
 // TODO(guidou): Remove this test. http://crbug.com/706408
 TEST_F(MediaStreamVideoWebRtcSinkTest, NoiseReductionConstraintPassThrough) {
   SetVideoTrack(base::Optional<bool>(true));
   MediaStreamVideoWebRtcSink my_sink(track_, &dependency_factory_);
   EXPECT_TRUE(my_sink.SourceNeedsDenoisingForTesting());
   EXPECT_TRUE(*(my_sink.SourceNeedsDenoisingForTesting()));
 }
 
 // TODO(guidou): Remove this test. http://crbug.com/706408
 class MediaStreamVideoWebRtcSinkOldConstraintsTest : public ::testing::Test {
  public:
-  MediaStreamVideoWebRtcSinkOldConstraintsTest() {
+  MediaStreamVideoWebRtcSinkOldConstraintsTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI) {
     scoped_feature_list_.InitAndEnableFeature(
         features::kMediaStreamOldVideoConstraints);
   }
 
   void SetVideoTrack() {
     registry_.Init("stream URL");
     registry_.AddVideoTrack("test video track");
     blink::WebVector<blink::WebMediaStreamTrack> video_tracks;
     registry_.test_stream().VideoTracks(video_tracks);
     track_ = video_tracks[0];
@@ skipping 23 matching lines @@
   }
 
  protected:
   blink::WebMediaStreamTrack track_;
   MockPeerConnectionDependencyFactory dependency_factory_;
 
  private:
   MockMediaStreamRegistry registry_;
   // A ChildProcess and a MessageLoopForUI are both needed to fool the Tracks
   // and Sources in |registry_| into believing they are on the right threads.
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   const ChildProcess child_process_;
   base::test::ScopedFeatureList scoped_feature_list_;
 };
 
 TEST_F(MediaStreamVideoWebRtcSinkOldConstraintsTest,
        NoiseReductionDefaultsToNotSet) {
   blink::WebMediaConstraints constraints;
   constraints.Initialize();
   SetVideoTrack(constraints);
   MediaStreamVideoWebRtcSink my_sink(track_, &dependency_factory_);
   EXPECT_TRUE(my_sink.webrtc_video_track());
   EXPECT_FALSE(my_sink.SourceNeedsDenoisingForTesting());
 }
 
 TEST_F(MediaStreamVideoWebRtcSinkOldConstraintsTest,
        NoiseReductionConstraintPassThrough) {
   MockConstraintFactory factory;
   factory.basic().goog_noise_reduction.SetExact(true);
   SetVideoTrack(factory.CreateWebMediaConstraints());
   MediaStreamVideoWebRtcSink my_sink(track_, &dependency_factory_);
   EXPECT_TRUE(my_sink.SourceNeedsDenoisingForTesting());
   EXPECT_TRUE(*(my_sink.SourceNeedsDenoisingForTesting()));
 }
 
 }  // namespace
 }  // namespace content