[tracing] Show the local storage databases under dom_storage

content/browser/dom_storage/dom_storage_database.cc

 // Copyright 2013 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/dom_storage/dom_storage_database.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "sql/statement.h"
@@ skipping 117 matching lines @@
   bool success = transaction.Commit();
   if (!success)
     known_to_be_empty_ = old_known_to_be_empty;
 
   // Reduce the size of sqlite caches.
   db_->TrimMemory(false /* aggressively */);
 
   return success;
 }
 
+void DOMStorageDatabase::ReportMemoryUsage(
+    base::trace_event::ProcessMemoryDump* pmd,
+    const std::string& name) {

[michaeln, 2016/12/05 22:42:53]

i think you need to check IsOpen() here

[ssid, 2016/12/08 18:09:47]

Done.

+  db_->ReportMemoryUsage(pmd, name);
+}
+
 bool DOMStorageDatabase::LazyOpen(bool create_if_needed) {
   if (failed_to_open_) {
     // Don't try to open a database that we know has failed
     // already.
     return false;
   }
 
   if (IsOpen())
     return true;
 
@@ skipping 146 matching lines @@
       CreateTableV2() &&
       CommitChanges(false, values) &&
       migration.Commit();
 }
 
 void DOMStorageDatabase::Close() {
   db_.reset(NULL);
 }
 
 }  // namespace content