DevTools: support scopes and iframes when debugging service workers.

content/browser/devtools/service_worker_devtools_agent_host.h

Index: content/browser/devtools/service_worker_devtools_agent_host.h
diff --git a/content/browser/devtools/service_worker_devtools_agent_host.h b/content/browser/devtools/service_worker_devtools_agent_host.h
index 48d70c35e5b1650b4a5b593617ef9c6af18a308a..947d8d0ff19cc65e6af4940fe3c342fb0c53c7c5 100644
--- a/content/browser/devtools/service_worker_devtools_agent_host.h
+++ b/content/browser/devtools/service_worker_devtools_agent_host.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_BROWSER_DEVTOOLS_SERVICE_WORKER_DEVTOOLS_AGENT_HOST_H_
 #define CONTENT_BROWSER_DEVTOOLS_SERVICE_WORKER_DEVTOOLS_AGENT_HOST_H_
 
+#include <set>
+
 #include "content/browser/devtools/service_worker_devtools_manager.h"
 #include "content/browser/devtools/worker_devtools_agent_host.h"
 
@@ -13,6 +15,7 @@ namespace content {
 class ServiceWorkerDevToolsAgentHost : public WorkerDevToolsAgentHost {
  public:
   using List = std::vector<scoped_refptr<ServiceWorkerDevToolsAgentHost>>;
+  using Set = std::set<scoped_refptr<ServiceWorkerDevToolsAgentHost>>;
   using ServiceWorkerIdentifier =
       ServiceWorkerDevToolsManager::ServiceWorkerIdentifier;