Extensions: Keep track of loaded extensions in RendererStartupHelper.

extensions/browser/renderer_startup_helper.h

Index: extensions/browser/renderer_startup_helper.h
diff --git a/extensions/browser/renderer_startup_helper.h b/extensions/browser/renderer_startup_helper.h
index 94ec3833b955795135c84650f0b857268d8be0d4..e8726bf3329061ccd8e81f61ab81f8f60cfe15e7 100644
--- a/extensions/browser/renderer_startup_helper.h
+++ b/extensions/browser/renderer_startup_helper.h
@@ -69,14 +69,16 @@ class RendererStartupHelper : public KeyedService,
   content::BrowserContext* browser_context_;  // Not owned.
 
   // The set of render processes that have had the initial batch of IPC messages
-  // sent, including the set of loaded extensions. Further messages that
+  // sent, together with the set of loaded extensions. Further messages that
   // activate, load, or unload extensions should not be sent until after this
-  // happens.
-  std::set<content::RenderProcessHost*> initialized_processes_;
+  // happens. Used to keep the track of initialized processes along with its
+  // loaded extensions.
+  std::map<content::RenderProcessHost*, std::set<ExtensionId>>
+      loaded_extensions_;
 
   // The set of ids for extensions that are active in a process that has not
-  // been initialized. The activation message will be sent the process is
-  // initialized.
+  // been initialized. The activation message will be sent once the process is
+  // initialized. This is only valid for uninitialized processes.
   std::map<content::RenderProcessHost*, std::set<ExtensionId>>
       pending_active_extensions_;