Fix media timeline so that thumb never exceeds buffered data

content/renderer/media/audio_renderer_impl_unittest.cc

Index: content/renderer/media/audio_renderer_impl_unittest.cc
diff --git a/content/renderer/media/audio_renderer_impl_unittest.cc b/content/renderer/media/audio_renderer_impl_unittest.cc
index 06b681b69b834e2a5c8b23bdd1f43d15fc1d050b..31230904e856b14cbd6995f1d7d001d6d1d17bbe 100644
--- a/content/renderer/media/audio_renderer_impl_unittest.cc
+++ b/content/renderer/media/audio_renderer_impl_unittest.cc
@@ -107,7 +107,7 @@ class AudioRendererImplTest
     renderer_ = new TestAudioRendererImpl(default_sink.get());
     renderer_->Initialize(decoder_,
                           media::NewExpectedStatusCB(media::PIPELINE_OK),
-                          NewUnderflowClosure());
+                          NewUnderflowClosure(), NewAudioTimeClosure());
 
     // We need an event to verify that all tasks are done before leaving
     // our tests.
@@ -125,6 +125,16 @@ class AudioRendererImplTest
                       base::Unretained(this));
   }
 
+  void OnAudioTimeCallback(
+      base::TimeDelta current_time, base::TimeDelta max_time) {
+    CHECK(current_time <= max_time);
+  }
+
+  media::AudioRenderer::AudioTimeCB NewAudioTimeClosure() {
+    return base::Bind(&AudioRendererImplTest::OnAudioTimeCallback,
+                      base::Unretained(this));
+  }
+
  protected:
   // Posts a final task to the IO message loop and waits for completion.
   void WaitForIOThreadCompletion() {