Implement disabling and enabling media tracks

media/test/pipeline_integration_test_base.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_TEST_PIPELINE_INTEGRATION_TEST_BASE_H_
 #define MEDIA_TEST_PIPELINE_INTEGRATION_TEST_BASE_H_
 
 #include <stdint.h>
 #include <memory>
 
@@ skipping 91 matching lines @@
   // after playback completes.  First time hashes should be generated with
   // --video-threads=1 to ensure correctness.  Pipeline must have been started
   // with hashing enabled.
   std::string GetVideoHash();
 
   // Returns the hash of all audio frames seen.  Should only be called once
   // after playback completes.  Pipeline must have been started with hashing
   // enabled.
   std::string GetAudioHash();
 
+  // Reset video hash to restart hashing from scratch (e.g. after a seek or
+  // after disabling a media track).
+  void ResetVideoHash();
+
   // Returns the time taken to render the complete audio file.
   // Pipeline must have been started with clockless playback enabled.
   base::TimeDelta GetAudioTime();
 
   // Sets a callback to handle EME "encrypted" event. Must be called to test
   // potentially encrypted media.
   void set_encrypted_media_init_data_cb(
       const Demuxer::EncryptedMediaInitDataCB& encrypted_media_init_data_cb) {
     encrypted_media_init_data_cb_ = encrypted_media_init_data_cb;
   }
@@ skipping 54 matching lines @@
                void(const TextTrackConfig& config,
                     const AddTextTrackDoneCB& done_cb));
   MOCK_METHOD0(OnWaitingForDecryptionKey, void(void));
   MOCK_METHOD1(OnVideoNaturalSizeChange, void(const gfx::Size&));
   MOCK_METHOD1(OnVideoOpacityChange, void(bool));
 };
 
 }  // namespace media
 
 #endif  // MEDIA_TEST_PIPELINE_INTEGRATION_TEST_BASE_H_