Fix crash when pipeline is stopped while video restart is pending

media/test/pipeline_integration_test.cc

Index: media/test/pipeline_integration_test.cc
diff --git a/media/test/pipeline_integration_test.cc b/media/test/pipeline_integration_test.cc
index cc1295872345efa77cfd4e274b2ddd8aa77a8b13..c06037618433ede1401362f0e9e67c3ce8de40a5 100644
--- a/media/test/pipeline_integration_test.cc
+++ b/media/test/pipeline_integration_test.cc
@@ -1062,6 +1062,36 @@ TEST_F(PipelineIntegrationTest, TrackStatusChangesWhileSuspended) {
   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,