Add UMA for how long service workers run for.

content/browser/service_worker/embedded_worker_instance.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/service_worker/embedded_worker_instance.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/macros.h"
@@ skipping 807 matching lines @@
 }
 
 void EmbeddedWorkerInstance::AddListener(Listener* listener) {
   listener_list_.AddObserver(listener);
 }
 
 void EmbeddedWorkerInstance::RemoveListener(Listener* listener) {
   listener_list_.RemoveObserver(listener);
 }
 
+void EmbeddedWorkerInstance::SetDevToolsAttached(bool attached) {
+  devtools_attached_ = attached;
+  if (attached)
+    registry_->OnDevToolsAttached(embedded_worker_id_);
+}
+
 void EmbeddedWorkerInstance::OnNetworkAccessedForScriptLoad() {
   starting_phase_ = SCRIPT_DOWNLOADING;
   network_accessed_for_script_ = true;
 }
 
 void EmbeddedWorkerInstance::ReleaseProcess() {
   // Abort an inflight start task.
   inflight_start_task_.reset();
 
   client_.reset();
@@ skipping 75 matching lines @@
     case SCRIPT_READ_FINISHED:
       return "Script read finished";
     case STARTING_PHASE_MAX_VALUE:
       NOTREACHED();
   }
   NOTREACHED() << phase;
   return std::string();
 }
 
 }  // namespace content