Don't return wall clock times when time isn't ticking.

media/renderers/audio_renderer_impl_unittest.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 "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/format_macros.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "media/base/audio_buffer_converter.h"
@@ skipping 501 matching lines @@
   StartTicking();
 
   // Force underflow.
   EXPECT_TRUE(ConsumeBufferedData(frames_buffered()));
   WaitForPendingRead();
   EXPECT_CALL(*this, OnBufferingStateChange(BUFFERING_HAVE_NOTHING));
   EXPECT_FALSE(ConsumeBufferedData(OutputFrames(1)));
   WaitForPendingRead();
   StopTicking();
 
+  // After time stops ticking wall clock times should not be returned.
+  EXPECT_FALSE(
+      renderer_->GetWallClockTimes(std::vector<base::TimeDelta>(1), nullptr));
+
   // We shouldn't expect another buffering state change when flushing.
   FlushDuringPendingRead();
 }
 
 TEST_F(AudioRendererImplTest, PendingRead_Flush) {
   Initialize();
 
   Preroll();
   StartTicking();
 
@@ skipping 210 matching lines @@
   // Start rendering with zero playback rate. Sink should be paused until
   // non-zero rate is set.
   renderer_->SetPlaybackRate(0.0);
   renderer_->StartTicking();
   EXPECT_EQ(FakeAudioRendererSink::kPaused, sink_->state());
   renderer_->SetPlaybackRate(1.0);
   EXPECT_EQ(FakeAudioRendererSink::kPlaying, sink_->state());
 }
 
 }  // namespace media