Web Inspector: count DOM storage cache memory for native snapshot

webkit/dom_storage/dom_storage_cached_area.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 "webkit/dom_storage/dom_storage_cached_area.h"
 
 #include "base/basictypes.h"
 #include "webkit/dom_storage/dom_storage_map.h"
 #include "webkit/dom_storage/dom_storage_proxy.h"
 
@@ skipping 113 matching lines @@
 
   // It's a set item event.
   // We turn off quota checking here to accomodate the over budget
   // allowance that's provided in the browser process.
   NullableString16 unused;
   map_->set_quota(kint32max);
   map_->SetItem(key.string(), new_value.string(), &unused);
   map_->set_quota(dom_storage::kPerAreaQuota);
 }
 
+size_t DomStorageCachedArea::MemoryBytesUsedByCache() const {
+  return map_ ? map_->bytes_used() : 0;
+}
+
 void DomStorageCachedArea::Prime(int connection_id) {
   DCHECK(!map_);
 
   // The LoadArea method is actually synchronous, but we have to
   // wait for an asyncly delivered message to know when incoming
   // mutation events should be applied. Our valuemap is plucked
   // from ipc stream out of order, mutations in front if it need
   // to be ignored.
 
   // Ignore all mutations until OnLoadComplete time.
@@ skipping 41 matching lines @@
     ignore_key_mutations_.erase(found);
 }
 
 void DomStorageCachedArea::OnClearComplete(bool success) {
   DCHECK(success);
   DCHECK(ignore_all_mutations_);
   ignore_all_mutations_ = false;
 }
 
 }  // namespace dom_storage