Fix progress reporting for multibuffers to report progress for every byte we receive.

media/blink/resource_multibuffer_data_provider.h

 // Copyright 2015 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_RESOURCE_MULTIBUFFER_DATA_PROVIDER_H_
 #define MEDIA_BLINK_RESOURCE_MULTIBUFFER_DATA_PROVIDER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 22 matching lines @@
 
   ResourceMultiBufferDataProvider(UrlData* url_data, MultiBufferBlockId pos);
   ~ResourceMultiBufferDataProvider() override;
 
   // Virtual for testing purposes.
   virtual void Start();
 
   // MultiBuffer::DataProvider implementation
   MultiBufferBlockId Tell() const override;
   bool Available() const override;
+  int64_t AvailableBytes() const override;
   scoped_refptr<DataBuffer> Read() override;
   void SetDeferred(bool defer) override;
 
   // blink::WebURLLoaderClient implementation.
   void willFollowRedirect(
       blink::WebURLLoader* loader,
       blink::WebURLRequest& newRequest,
       const blink::WebURLResponse& redirectResponse) override;
   void didSendData(blink::WebURLLoader* loader,
                    unsigned long long bytesSent,
@@ skipping 70 matching lines @@
 
   // When we encounter a redirect, this is the source of the redirect.
   GURL redirects_to_;
 
   base::WeakPtrFactory<ResourceMultiBufferDataProvider> weak_factory_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_RESOURCE_MULTIBUFFER_RESOURCE_LOADER_H_