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..cf490f50e57e425577ec12934435ec97ec4bb82e 100644
--- a/extensions/browser/renderer_startup_helper.h
+++ b/extensions/browser/renderer_startup_helper.h
@@ -47,7 +47,8 @@ class RendererStartupHelper : public KeyedService,
                const content::NotificationDetails& details) override;
 
   // Sends a message to the specified |process| activating the given extension
-  // once the process is initialized.
+  // once the process is initialized. OnExtensionLoaded should have already been
+  // called for the extension.
   void ActivateExtensionInProcess(const Extension& extension,
                                   content::RenderProcessHost* process);
 
@@ -59,6 +60,8 @@ class RendererStartupHelper : public KeyedService,
   void OnExtensionLoaded(const Extension& extension);
 
  private:
+  friend class RendererStartupHelperTest;
+
   // Initializes the specified process, informing it of system state and loaded
   // extensions.
   void InitializeProcess(content::RenderProcessHost* process);
@@ -68,6 +71,10 @@ class RendererStartupHelper : public KeyedService,
 
   content::BrowserContext* browser_context_;  // Not owned.
 
+  // Tracks the set of loaded extensions and the processes they are loaded in.
+  std::map<ExtensionId, std::set<content::RenderProcessHost*>>
+      extension_process_map_;
+
   // The set of render processes that have had the initial batch of IPC messages
   // sent, including the set of loaded extensions. Further messages that
   // activate, load, or unload extensions should not be sent until after this