make multibuffer work with layout tests

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 <string>
 #include <vector>
 
@@ skipping 124 matching lines @@
   // BufferedResourceLoader::Start() callback for initial load.
   void StartCallback();
 
   // Check if we've moved to a new url and update has_signgle_origin_.
   void UpdateSingleOrigin();
 
   // MultiBufferReader progress callback.
   void ProgressCallback(int64 begin, int64 end);
 
   // call downloading_cb_ if needed.
-  void UpdateLoadingState();
+  // If |force_loading| is true, we call downloading_cb_ and tell it that
+  // we are currently loading, regardless of what reader_->IsLoading() says.
+  void UpdateLoadingState(bool force_loading);
 
   // Update |reader_|'s preload and buffer settings.
   void UpdateBufferSizes();
 
   // crossorigin attribute on the corresponding HTML media element, if any.
   UrlData::CORSMode cors_mode_;
 
   // URL of the resource requested.
   scoped_refptr<UrlData> url_data_;
 
   // The total size of the resource. Set during StartCallback() if the size is
   // known, otherwise it will remain kPositionNotSpecified until the size is
   // determined by reaching EOF.
   int64 total_bytes_;
 
   // This value will be true if this data source can only support streaming.
   // i.e. range request is not supported.
   bool streaming_;
 
+  // This is the loading state that we last reported to our owner through
+  // |downloading_cb_|.
   bool loading_;
 
   // The task runner of the render thread.
   const scoped_refptr<base::SingleThreadTaskRunner> render_task_runner_;
 
   // Shared cache.
   linked_ptr<UrlIndex> url_index_;
 
   // A webframe for loading.
   blink::WebFrame* frame_;
@@ skipping 59 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_