Add uma stats to help evaluate the impact of changes to the quota allocation logic.

content/browser/appcache/appcache_response.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_APPCACHE_APPCACHE_RESPONSE_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_RESPONSE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 76 matching lines @@
                       int64_t offset,
                       net::IOBuffer* buf,
                       int buf_len,
                       const net::CompletionCallback& callback) = 0;
     virtual int64_t GetSize(int index) = 0;
     virtual void Close() = 0;
    protected:
     virtual ~Entry() {}
   };
 
-  AppCacheDiskCacheInterface();
+  // The uma_name pointer must remain valid for the life of the object.
+  AppCacheDiskCacheInterface(const char* uma_name);
 
   virtual int CreateEntry(int64_t key,
                           Entry** entry,
                           const net::CompletionCallback& callback) = 0;
   virtual int OpenEntry(int64_t key,
                         Entry** entry,
                         const net::CompletionCallback& callback) = 0;
   virtual int DoomEntry(int64_t key,
                         const net::CompletionCallback& callback) = 0;
 
+  const char* uma_name() const { return uma_name_; }
   base::WeakPtr<AppCacheDiskCacheInterface> GetWeakPtr();
 
  protected:
   virtual ~AppCacheDiskCacheInterface();
 
+  const char* uma_name_;
   base::WeakPtrFactory<AppCacheDiskCacheInterface> weak_factory_;
 };
 
 // Common base class for response reader and writer.
 class CONTENT_EXPORT AppCacheResponseIO {
  public:
   virtual ~AppCacheResponseIO();
   int64_t response_id() const { return response_id_; }
 
  protected:
@@ skipping 196 matching lines @@
   void OnIOComplete(int result) override;
   void OnOpenEntryComplete() override;
 
   int write_amount_;
   base::WeakPtrFactory<AppCacheResponseMetadataWriter> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_RESPONSE_H_