Convert the PluginService interface to be an async wrapper around PluginList.

chrome/browser/metrics/metrics_service.h

 // Copyright (c) 2011 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.
 
 // This file defines a service that collects information about the user
 // experience in order to help improve future versions of the app.
 
 #ifndef CHROME_BROWSER_METRICS_METRICS_SERVICE_H_
 #define CHROME_BROWSER_METRICS_METRICS_SERVICE_H_
 #pragma once
@@ skipping 20 matching lines @@
 class HistogramSynchronizer;
 class MetricsLogBase;
 class MetricsReportingScheduler;
 class PrefService;
 class Profile;
 class TemplateURLService;
 
 namespace base {
 class DictionaryValue;
 class ListValue;
+class MessageLoopProxy;
 }
 
 namespace prerender {
 bool IsOmniboxEnabled(Profile* profile);
 }
 
 namespace webkit {
 struct WebPluginInfo;
 }
 
@@ skipping 107 matching lines @@
     SEND_OLD_INITIAL_LOGS,  // Sending unsent logs from previous session.
     SENDING_OLD_LOGS,       // Sending unsent logs from previous session.
     SENDING_CURRENT_LOGS,   // Sending standard current logs as they acrue.
   };
 
   enum ShutdownCleanliness {
     CLEANLY_SHUTDOWN = 0xdeadbeef,
     NEED_TO_SHUTDOWN = ~CLEANLY_SHUTDOWN
   };
 
-  class InitTask;
-  class InitTaskComplete;
+  // First part of the init task. Called on the FILE thread to load hardware
+  // class information.
+  void InitTaskGetHardwareClass(base::MessageLoopProxy* target_loop);
 
-  // Callback to let us know that the init task is done.
-  void OnInitTaskComplete(
-      const std::string& hardware_class,
+  // Callback from InitTaskGetHardwareClass() that continues the init task by
+  // loading plugin information.
+  void OnInitTaskGotHardwareClass(const std::string& hardware_class);
+
+  // Callback from PluginService::GetPlugins() that moves the state to
+  // INIT_TASK_DONE.
+  void OnInitTaskGotPluginInfo(
       const std::vector<webkit::WebPluginInfo>& plugins);
 
   // When we start a new version of Chromium (different from our last run), we
   // need to discard the old crash stats so that we don't attribute crashes etc.
   // in the old version to the current version (via current logs).
   // Without this, a common reason to finally start a new version is to crash
   // the old version (after an autoupdate has arrived), and so we'd bias
   // initial results towards showing crashes :-(.
   static void DiscardOldStabilityStats(PrefService* local_state);
 
@@ skipping 280 matching lines @@
   friend class InstantFieldTrial;
   friend bool prerender::IsOmniboxEnabled(Profile* profile);
 
   // Returns true if prefs::kMetricsReportingEnabled is set.
   static bool IsMetricsReportingEnabled();
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(MetricsServiceHelper);
 };
 
 #endif  // CHROME_BROWSER_METRICS_METRICS_SERVICE_H_