Fix crash when pipeline is stopped while video restart is pending

media/test/pipeline_integration_test.cc

 // 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 <stdint.h>
 
 #include <memory>
 #include <utility>
 
@@ skipping 1047 matching lines @@
   ASSERT_TRUE(WaitUntilCurrentTimeIsAfter(TimestampMs(400)));
   ASSERT_TRUE(Suspend());
 
   // Re-enable video track.
   track_ids.push_back("1");
   pipeline_->OnSelectedVideoTrackChanged(track_ids);
   ASSERT_TRUE(Resume(TimestampMs(400)));
   ASSERT_TRUE(WaitUntilOnEnded());
 }
 
+TEST_F(PipelineIntegrationTest, PipelineStoppedWhileAudioRestartPending) {
+  ASSERT_EQ(PIPELINE_OK, Start("bear-320x240.webm"));
+  Play();
+
+  // Disable audio track first, to re-enable it later and stop the pipeline
+  // (which destroys the media renderer) while audio restart is pending.
+  std::vector<MediaTrack::Id> track_ids;
+  pipeline_->OnEnabledAudioTracksChanged(track_ids);
+  ASSERT_TRUE(WaitUntilCurrentTimeIsAfter(TimestampMs(200)));
+
+  track_ids.push_back("2");
+  pipeline_->OnEnabledAudioTracksChanged(track_ids);
+  Stop();
+}
+
+TEST_F(PipelineIntegrationTest, PipelineStoppedWhileVideoRestartPending) {
+  ASSERT_EQ(PIPELINE_OK, Start("bear-320x240.webm"));
+  Play();
+
+  // Disable video track first, to re-enable it later and stop the pipeline
+  // (which destroys the media renderer) while video restart is pending.
+  std::vector<MediaTrack::Id> track_ids;
+  pipeline_->OnSelectedVideoTrackChanged(track_ids);
+  ASSERT_TRUE(WaitUntilCurrentTimeIsAfter(TimestampMs(200)));
+
+  track_ids.push_back("1");
+  pipeline_->OnSelectedVideoTrackChanged(track_ids);
+  Stop();
+}
+
 TEST_F(PipelineIntegrationTest,
        MAYBE_CLOCKLESS(BasicPlaybackOpusOggTrimmingHashed)) {
   ASSERT_EQ(PIPELINE_OK,
             Start("opus-trimming-test.webm", kHashed | kClockless));
 
   Play();
 
   ASSERT_TRUE(WaitUntilOnEnded());
   EXPECT_HASH_EQ(kOpusEndTrimmingHash_1, GetAudioHash());
 
@@ skipping 1474 matching lines @@
 
 TEST_F(PipelineIntegrationTest, BasicPlaybackPositiveStartTime) {
   ASSERT_EQ(PIPELINE_OK, Start("nonzero-start-time.webm"));
   Play();
   ASSERT_TRUE(WaitUntilOnEnded());
   ASSERT_EQ(base::TimeDelta::FromMicroseconds(396000),
             demuxer_->GetStartTime());
 }
 
 }  // namespace media