media: Support better decoder switching

media/base/mock_filters.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_MOCK_FILTERS_H_
 #define MEDIA_BASE_MOCK_FILTERS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 161 matching lines @@
   Type type_;
   Liveness liveness_;
   AudioDecoderConfig audio_decoder_config_;
   VideoDecoderConfig video_decoder_config_;
 
   DISALLOW_COPY_AND_ASSIGN(MockDemuxerStream);
 };
 
 class MockVideoDecoder : public VideoDecoder {
  public:
-  MockVideoDecoder();
+  explicit MockVideoDecoder(const std::string& decoder_name = "");

[watk, 2017/05/04 21:35:32]

You can default the name to "MockVideoDecoder" here instead of in
GetDisplayName()?

   virtual ~MockVideoDecoder();
 
   // VideoDecoder implementation.
   virtual std::string GetDisplayName() const;
   MOCK_METHOD5(Initialize,
                void(const VideoDecoderConfig& config,
                     bool low_delay,
                     CdmContext* cdm_context,
                     const InitCB& init_cb,
                     const OutputCB& output_cb));
   MOCK_METHOD2(Decode, void(const scoped_refptr<DecoderBuffer>& buffer,
                             const DecodeCB&));
   MOCK_METHOD1(Reset, void(const base::Closure&));
   MOCK_CONST_METHOD0(HasAlpha, bool());
   MOCK_CONST_METHOD0(CanReadWithoutStalling, bool());
 
  private:
+  std::string decoder_name_;
   DISALLOW_COPY_AND_ASSIGN(MockVideoDecoder);
 };
 
 class MockAudioDecoder : public AudioDecoder {
  public:
-  MockAudioDecoder();
+  explicit MockAudioDecoder(const std::string& decoder_name = "");
   virtual ~MockAudioDecoder();
 
   // AudioDecoder implementation.
   virtual std::string GetDisplayName() const;
   MOCK_METHOD4(Initialize,
                void(const AudioDecoderConfig& config,
                     CdmContext* cdm_context,
                     const InitCB& init_cb,
                     const OutputCB& output_cb));
   MOCK_METHOD2(Decode,
                void(const scoped_refptr<DecoderBuffer>& buffer,
                     const DecodeCB&));
   MOCK_METHOD1(Reset, void(const base::Closure&));
 
  private:
+  std::string decoder_name_;
   DISALLOW_COPY_AND_ASSIGN(MockAudioDecoder);
 };
 
 class MockRendererClient : public RendererClient {
  public:
   MockRendererClient();
   ~MockRendererClient();
 
   // RendererClient implementation.
   MOCK_METHOD1(OnError, void(PipelineStatus));
@@ skipping 351 matching lines @@
   MOCK_METHOD0(Flush, void());
   MOCK_METHOD2(Parse, bool(const uint8_t*, int));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockStreamParser);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MOCK_FILTERS_H_