DevTools: Never instantiate DevToolsAgentHost on threads other than UI

content/browser/devtools/devtools_http_handler_impl.h

Index: content/browser/devtools/devtools_http_handler_impl.h
diff --git a/content/browser/devtools/devtools_http_handler_impl.h b/content/browser/devtools/devtools_http_handler_impl.h
index f7ccca02d45ab4c7bb5c9022c6c547eb4e9f1343..cce4a6105659483aa6a3a8520e1b1c6bcf5b37fc 100644
--- a/content/browser/devtools/devtools_http_handler_impl.h
+++ b/content/browser/devtools/devtools_http_handler_impl.h
@@ -80,8 +80,13 @@ class DevToolsHttpHandlerImpl
   void ResetHandlerThread();
   void ResetHandlerThreadAndRelease();
 
-  void CollectWorkerInfo(base::ListValue* target_list, std::string host);
-  void SendTargetList(int connection_id, base::ListValue* target_list);
+  typedef std::vector<WorkerService::WorkerInfo> WorkerInfoList;
+
+  WorkerInfoList CollectWorkerInfo();
+  void SendTargetList(int connection_id,
+                      const std::string& host,
+                      base::ListValue* target_list,
+                      const WorkerInfoList& worker_info_list);
 
   void Init();
   void Teardown();