media: Add UMA stats for bytes going in and out of multibuffer cache

media/blink/url_index.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_URL_INDEX_H_
 #define MEDIA_BLINK_URL_INDEX_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 125 matching lines @@
   // that have already been opened.
   bool Valid();
 
   // Virtual so we can override it for testing.
   virtual ResourceMultiBuffer* multibuffer();
 
   // Accessor
   blink::WebLocalFrame* frame() const { return frame_; }
 
   void AddBytesRead(int64_t b) { bytes_read_from_cache_ += b; }
-  int64_t BytesReadFromCache() { return bytes_read_from_cache_; }
+  int64_t BytesReadFromCache() const { return bytes_read_from_cache_; }
+  void AddBytesReadFromNetwork(int64_t b) { bytes_read_from_network_ += b; }
+  int64_t BytesReadFromNetwork() const { return bytes_read_from_network_; }
 
  protected:
   UrlData(const GURL& url,
           CORSMode cors_mode,
           const base::WeakPtr<UrlIndex>& url_index);
   virtual ~UrlData();
 
  private:
   friend class ResourceMultiBuffer;
   friend class UrlIndex;
@@ skipping 15 matching lines @@
   const CORSMode cors_mode_;
 
   base::WeakPtr<UrlIndex> url_index_;
 
   // Length of resource this url points to. (in bytes)
   int64_t length_;
 
   // Number of bytes read from this resource.
   int64_t bytes_read_from_cache_ = 0;
 
+  // Number of bytes read from network into the cache for this resource.
+  int64_t bytes_read_from_network_ = 0;
+
   // Does the server support ranges?
   bool range_supported_;
 
   // Set to false if we have reason to beleive the chrome disk cache
   // will not cache this url.
   bool cacheable_;
 
   // Last time some media time used this resource.
   // Note that we use base::Time rather than base::TimeTicks because
   // TimeTicks will stop advancing when a machine goes to sleep.
@@ skipping 69 matching lines @@
   // log2 of block size in multibuffer cache. Defaults to kBlockSizeShift.
   // Currently only changed for testing purposes.
   const int block_shift_;
 
  protected:
   base::WeakPtrFactory<UrlIndex> weak_factory_;
 };
 
 }  // namespace media
 #endif  // MEDIA_BLINK_URL_INDEX_H_