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

content/browser/appcache/appcache_disk_cache.cc

 // 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.
 
 #include "content/browser/appcache/appcache_disk_cache.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 299 matching lines @@
     return net::ERR_IO_PENDING;
   }
 
   if (!disk_cache_)
     return net::ERR_FAILED;
 
   return ActiveCall::DoomEntry(weak_factory_.GetWeakPtr(), key, callback);
 }
 
 AppCacheDiskCache::AppCacheDiskCache(bool use_simple_cache)
-    : use_simple_cache_(use_simple_cache),
+    : AppCacheDiskCacheInterface("DiskCache.AppCache"),
+      use_simple_cache_(use_simple_cache),
       is_disabled_(false),
       is_waiting_to_initialize_(false),
-      weak_factory_(this) {
-}
+      weak_factory_(this) {}
 
 AppCacheDiskCache::PendingCall::PendingCall()
     : call_type(CREATE),
       key(0),
       entry(NULL) {
 }
 
 AppCacheDiskCache::PendingCall::PendingCall(
     PendingCallType call_type,
     int64_t key,
@@ skipping 65 matching lines @@
         NOTREACHED();
         break;
     }
     if (rv != net::ERR_IO_PENDING)
       iter->callback.Run(rv);
   }
   pending_calls_.clear();
 }
 
 }  // namespace content