Add a lot of Pipeline tests to cover stopping/error handling while in a variety of states.

media/base/pipeline.h

 // 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.
 
 #ifndef MEDIA_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 202 matching lines @@
   void GetNaturalVideoSize(gfx::Size* out_size) const;
 
   // Return true if loading progress has been made since the last time this
   // method was called.
   bool DidLoadingProgress() const;
 
   // Gets the current pipeline statistics.
   PipelineStatistics GetStatistics() const;
 
   void SetClockForTesting(Clock* clock);
+  void SetErrorForTesting(PipelineStatus status);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(PipelineTest, GetBufferedTimeRanges);
   FRIEND_TEST_ALL_PREFIXES(PipelineTest, DisableAudioRenderer);
   FRIEND_TEST_ALL_PREFIXES(PipelineTest, DisableAudioRendererDuringInit);
   FRIEND_TEST_ALL_PREFIXES(PipelineTest, EndedCallback);
   FRIEND_TEST_ALL_PREFIXES(PipelineTest, AudioStreamShorterThanVideo);
   friend class MediaLog;
 
   // Only allow ourselves to be deleted by reference counting.
@@ skipping 326 matching lines @@
   base::Time creation_time_;
 
   scoped_ptr<SerialRunner> pending_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(Pipeline);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_