Add support for cancellation of demuxer reads.

media/blink/multibuffer_data_source.h

 // Copyright 2013 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_BLINK_MULTIBUFFER_DATA_SOURCE_H_
 #define MEDIA_BLINK_MULTIBUFFER_DATA_SOURCE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 79 matching lines @@
 
   // Returns true if the media resource has a single origin, false otherwise.
   // Only valid to call after Initialize() has completed.
   //
   // Method called on the render thread.
   bool HasSingleOrigin();
 
   // Returns true if the media resource passed a CORS access control check.
   bool DidPassCORSAccessCheck() const;
 
-  // Cancels initialization, any pending loaders, and any pending read calls
-  // from the demuxer. The caller is expected to release its reference to this
-  // object and never call it again.
-  //
-  // Method called on the render thread.
-  void Abort();
-
   // Notifies changes in playback state for controlling media buffering
   // behavior.
   void MediaPlaybackRateChanged(double playback_rate);
   void MediaIsPlaying();
   bool media_has_played() const;
 
   // Returns true if the resource is local.
   bool assume_fully_buffered();
 
   // Cancels any open network connections once reaching the deferred state. If
   // |always_cancel| is false this is done only for preload=metadata, non-
   // streaming resources that have not started playback. If |always_cancel| is
   // true, all resource types will have their connections canceled. If already
   // deferred, connections will be immediately closed.
   void OnBufferingHaveEnough(bool always_cancel);
 
   int64_t GetMemoryUsage() const;
 
   GURL GetUrlAfterRedirects() const;
 
   // DataSource implementation.
   // Called from demuxer thread.
   void Stop() override;
+  void Abort() override;
 
   void Read(int64_t position,
             int size,
             uint8_t* data,
             const DataSource::ReadCB& read_cb) override;
   bool GetSize(int64_t* size_out) override;
   bool IsStreaming() override;
   void SetBitrate(int bitrate) override;
 
  protected:
@@ skipping 128 matching lines @@
   // reaching into this class from multiple threads to attain a WeakPtr.
   base::WeakPtr<MultibufferDataSource> weak_ptr_;
   base::WeakPtrFactory<MultibufferDataSource> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MultibufferDataSource);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_MULTIBUFFER_DATA_SOURCE_H_