[tracing] Add a memory dump provider for DOM storage

content/browser/dom_storage/dom_storage_task_runner.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_task_runner.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/tracked_objects.h"
@@ skipping 50 matching lines @@
       IDtoToken(sequence_id), from_here, task,
       base::SequencedWorkerPool::BLOCK_SHUTDOWN);
 }
 
 bool DOMStorageWorkerPoolTaskRunner::IsRunningOnSequence(
     SequenceID sequence_id) const {
   return sequenced_worker_pool_->IsRunningSequenceOnCurrentThread(
       IDtoToken(sequence_id));
 }
 
+scoped_refptr<base::SequencedTaskRunner>
+DOMStorageWorkerPoolTaskRunner::GetSequencedTaskRunner(SequenceID sequence_id) {
+  return sequenced_worker_pool_->GetSequencedTaskRunner(IDtoToken(sequence_id));
+}
+
 base::SequencedWorkerPool::SequenceToken
 DOMStorageWorkerPoolTaskRunner::IDtoToken(SequenceID id) const {
   if (id == PRIMARY_SEQUENCE)
     return primary_sequence_token_;
   DCHECK_EQ(COMMIT_SEQUENCE, id);
   return commit_sequence_token_;
 }
 
 // MockDOMStorageTaskRunner
 
@@ skipping 16 matching lines @@
     const tracked_objects::Location& from_here,
     SequenceID sequence_id,
     const base::Closure& task) {
   return task_runner_->PostTask(from_here, task);
 }
 
 bool MockDOMStorageTaskRunner::IsRunningOnSequence(SequenceID) const {
   return task_runner_->RunsTasksOnCurrentThread();
 }
 
+scoped_refptr<base::SequencedTaskRunner>
+MockDOMStorageTaskRunner::GetSequencedTaskRunner(SequenceID sequence_id) {
+  return task_runner_;
+}
+
 }  // namespace content