Manually declare media_format() because gmock does not like mocking non-copyable const references.

media/base/mock_filters.h

 // Copyright (c) 2009 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.
 //
 // A new breed of mock media filters, this time using gmock!  Feel free to add
 // actions if you need interesting side-effects (i.e., copying data to the
 // buffer passed into MockDataSource::Read()).
 //
 // Don't forget you can use StrictMock<> and NiceMock<> if you want the mock
 // filters to fail the test or do nothing when an unexpected method is called.
@@ skipping 12 matching lines @@
  public:
   MockDataSource() {}
 
   // MediaFilter implementation.
   MOCK_METHOD0(Stop, void());
   MOCK_METHOD1(SetPlaybackRate, void(float playback_rate));
   MOCK_METHOD1(Seek, void(base::TimeDelta time));
 
   // DataSource implementation.
   MOCK_METHOD1(Initialize, bool(const std::string& url));
-  MOCK_METHOD0(media_format, const MediaFormat&());
+  const MediaFormat& media_format() { return media_format_; }
   MOCK_METHOD2(Read, size_t(uint8* data, size_t size));
   MOCK_METHOD1(GetPosition, bool(int64* position_out));
   MOCK_METHOD1(SetPosition, bool(int64 position));
   MOCK_METHOD1(GetSize, bool(int64* size_out));
   MOCK_METHOD0(IsSeekable, bool());
 
  protected:
   virtual ~MockDataSource() {}
 
  private:
+  MediaFormat media_format_;
+
   DISALLOW_COPY_AND_ASSIGN(MockDataSource);
 };
 
 class MockDemuxer : public Demuxer {
  public:
   MockDemuxer() {}
 
   // MediaFilter implementation.
   MOCK_METHOD0(Stop, void());
   MOCK_METHOD1(SetPlaybackRate, void(float playback_rate));
   MOCK_METHOD1(Seek, void(base::TimeDelta time));
 
   // Demuxer implementation.
   MOCK_METHOD1(Initialize, bool(DataSource* data_source));
   MOCK_METHOD0(GetNumberOfStreams, size_t());
   MOCK_METHOD1(GetStream, scoped_refptr<DemuxerStream>(int stream_id));
 
  protected:
   virtual ~MockDemuxer() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockDemuxer);
 };
 
 class MockDemuxerStream : public DemuxerStream {
  public:
   MockDemuxerStream() {}
 
   // DemuxerStream implementation.
-  MOCK_METHOD0(media_format, const MediaFormat&());
+  const MediaFormat& media_format() { return media_format_; }
   MOCK_METHOD1(Read, void(Callback1<Buffer*>::Type* read_callback));
   MOCK_METHOD1(QueryInterface, void*(const char* interface_id));
 
  protected:
   virtual ~MockDemuxerStream() {}
 
  private:
+  MediaFormat media_format_;
+
   DISALLOW_COPY_AND_ASSIGN(MockDemuxerStream);
 };
 
 class MockVideoDecoder : public VideoDecoder {
  public:
   MockVideoDecoder() {}
 
   // MediaFilter implementation.
   MOCK_METHOD0(Stop, void());
   MOCK_METHOD1(SetPlaybackRate, void(float playback_rate));
   MOCK_METHOD1(Seek, void(base::TimeDelta time));
 
   // VideoDecoder implementation.
   MOCK_METHOD1(Initialize, bool(DemuxerStream* demuxer_stream));
-  MOCK_METHOD0(media_format, const MediaFormat&());
+  const MediaFormat& media_format() { return media_format_; }
   MOCK_METHOD1(Read, void(Callback1<VideoFrame*>::Type* read_callback));
 
  protected:
   virtual ~MockVideoDecoder() {}
 
  private:
+  MediaFormat media_format_;
+
   DISALLOW_COPY_AND_ASSIGN(MockVideoDecoder);
 };
 
 class MockAudioDecoder : public AudioDecoder {
  public:
   MockAudioDecoder() {}
 
   // MediaFilter implementation.
   MOCK_METHOD0(Stop, void());
   MOCK_METHOD1(SetPlaybackRate, void(float playback_rate));
   MOCK_METHOD1(Seek, void(base::TimeDelta time));
 
   // AudioDecoder implementation.
   MOCK_METHOD1(Initialize, bool(DemuxerStream* demuxer_stream));
-  MOCK_METHOD0(media_format, const MediaFormat&());
+  const MediaFormat& media_format() { return media_format_; }
   MOCK_METHOD1(Read, void(Callback1<Buffer*>::Type* read_callback));
 
  protected:
   virtual ~MockAudioDecoder() {}
 
  private:
+  MediaFormat media_format_;
+
   DISALLOW_COPY_AND_ASSIGN(MockAudioDecoder);
 };
 
 class MockVideoRenderer : public VideoRenderer {
  public:
   MockVideoRenderer() {}
 
   // MediaFilter implementation.
   MOCK_METHOD0(Stop, void());
   MOCK_METHOD1(SetPlaybackRate, void(float playback_rate));
@@ skipping 80 matching lines @@
   scoped_refptr<MockAudioDecoder> audio_decoder_;
   scoped_refptr<MockVideoRenderer> video_renderer_;
   scoped_refptr<MockAudioRenderer> audio_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(MockFilterFactory);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MOCK_FILTERS_H_