[Extensions] Short-circuit activity logging if not enabled

chrome/browser/renderer_host/chrome_extension_message_filter.h

Index: chrome/browser/renderer_host/chrome_extension_message_filter.h
diff --git a/chrome/browser/renderer_host/chrome_extension_message_filter.h b/chrome/browser/renderer_host/chrome_extension_message_filter.h
index 087740dde512d0aacb1652fad308a5a26cfacf54..12d09e41a2b2f7692e69a5bd74881fd5566d78b9 100644
--- a/chrome/browser/renderer_host/chrome_extension_message_filter.h
+++ b/chrome/browser/renderer_host/chrome_extension_message_filter.h
@@ -25,6 +25,7 @@ class FilePath;
 }
 
 namespace extensions {
+class ActivityLog;
 class InfoMap;
 struct Message;
 }
@@ -108,6 +109,9 @@ class ChromeExtensionMessageFilter : public content::BrowserMessageFilter,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
+  // Returns true if an action should be logged for the given extension.
+  bool ShouldLogExtensionAction(const std::string& extension_id) const;
+
   const int render_process_id_;
 
   // The Profile associated with our renderer process.  This should only be
@@ -116,6 +120,10 @@ class ChromeExtensionMessageFilter : public content::BrowserMessageFilter,
   // calls and the like.
   Profile* profile_;
 
+  // The ActivityLog associated with the given profile. Also only safe to
+  // access on the UI thread, and may be null.
+  extensions::ActivityLog* activity_log_;
+
   scoped_refptr<extensions::InfoMap> extension_info_map_;
 
   content::NotificationRegistrar notification_registrar_;