[tracing] Add a memory dump provider for DOM storage

content/browser/dom_storage/dom_storage_task_runner.cc

Index: content/browser/dom_storage/dom_storage_task_runner.cc
diff --git a/content/browser/dom_storage/dom_storage_task_runner.cc b/content/browser/dom_storage/dom_storage_task_runner.cc
index cf2204d5b4ef8c2b898db6afd455c05409b8fccc..c594989eea17eb993eb44cd3ea573a4da1f91f74 100644
--- a/content/browser/dom_storage/dom_storage_task_runner.cc
+++ b/content/browser/dom_storage/dom_storage_task_runner.cc
@@ -68,6 +68,11 @@ bool DOMStorageWorkerPoolTaskRunner::IsRunningOnSequence(
       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)
@@ -104,4 +109,9 @@ bool MockDOMStorageTaskRunner::IsRunningOnSequence(SequenceID) const {
   return task_runner_->RunsTasksOnCurrentThread();
 }
 
+scoped_refptr<base::SequencedTaskRunner>
+MockDOMStorageTaskRunner::GetSequencedTaskRunner(SequenceID sequence_id) {
+  return task_runner_;
+}
+
 }  // namespace content