Add UMA for how long service workers run for.

content/browser/service_worker/embedded_worker_registry.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_REGISTRY_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_REGISTRY_H_
 
 #include <map>
 #include <memory>
 #include <set>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
+#include "content/browser/service_worker/service_worker_lifetime_tracker.h"
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 
 class GURL;
 
 namespace IPC {
 class Message;
 }
 
 namespace content {
@@ skipping 48 matching lines @@
                          const base::string16& error_message,
                          int line_number,
                          int column_number,
                          const GURL& source_url);
   void OnReportConsoleMessage(int embedded_worker_id,
                               int source_identifier,
                               int message_level,
                               const base::string16& message,
                               int line_number,
                               const GURL& source_url);
+  // Called by EmbeddedWorkerInstance when it learns DevTools has attached to
+  // it.
+  void OnDevToolsAttached(int embedded_worker_id);
 
   // Removes information about the service workers running on the process and
   // calls ServiceWorkerVersion::OnDetached() on each. Called when the process
   // is terminated. Under normal operation, the workers should already have
   // been stopped before the process is terminated, in which case this function
   // does nothing. But in some cases the process can be terminated unexpectedly
   // or the workers can fail to stop cleanly.
   void RemoveProcess(int process_id);
 
   // Returns an embedded worker instance for given |embedded_worker_id|.
@@ skipping 39 matching lines @@
   base::WeakPtr<ServiceWorkerContextCore> context_;
 
   WorkerInstanceMap worker_map_;
 
   // Map from process_id to embedded_worker_id.
   // This map only contains starting and running workers.
   std::map<int, std::set<int> > worker_process_map_;
 
   int next_embedded_worker_id_;
   const int initial_embedded_worker_id_;
+  ServiceWorkerLifetimeTracker lifetime_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(EmbeddedWorkerRegistry);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_REGISTRY_H_