Introduce CancelUponDeferral() to buffered media loaders.

media/blink/buffered_resource_loader.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_BUFFERED_RESOURCE_LOADER_H_
 #define MEDIA_BLINK_BUFFERED_RESOURCE_LOADER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 180 matching lines @@
   // Parse a Content-Range header into its component pieces and return true if
   // each of the expected elements was found & parsed correctly.
   // |*instance_size| may be set to kPositionNotSpecified if the range ends in
   // "/*".
   // NOTE: only public for testing!  This is an implementation detail of
   // VerifyPartialResponse (a private method).
   static bool ParseContentRange(
       const std::string& content_range_str, int64* first_byte_position,
       int64* last_byte_position, int64* instance_size);
 
+  // Cancels and closes any outstanding deferred ActiveLoader instances. Does
+  // not report a failed state, so subsequent read calls to cache may still
+  // complete okay. If the ActiveLoader is not deferred it will be canceled once
+  // it is unless playback starts before then (as determined by the reported
+  // playback rate).
+  void CancelUponDeferral();
+
  private:
   friend class BufferedDataSourceTest;
   friend class BufferedResourceLoaderTest;
   friend class MockBufferedDataSource;
 
   // Updates the |buffer_|'s forward and backward capacities.
   void UpdateBufferWindow();
 
   // Updates deferring behavior based on current buffering scheme.
   void UpdateDeferBehavior();
@@ skipping 93 matching lines @@
   scoped_ptr<blink::WebURLLoader> test_loader_;
 
   // Bitrate of the media. Set to 0 if unknown.
   int bitrate_;
 
   // Playback rate of the media.
   float playback_rate_;
 
   scoped_refptr<MediaLog> media_log_;
 
+  bool cancel_upon_deferral_;
+
   DISALLOW_COPY_AND_ASSIGN(BufferedResourceLoader);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_BUFFERED_RESOURCE_LOADER_H_