Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/browser/ui/views/toolbar/browser_actions_container.h

Index: chrome/browser/ui/views/toolbar/browser_actions_container.h
diff --git a/chrome/browser/ui/views/toolbar/browser_actions_container.h b/chrome/browser/ui/views/toolbar/browser_actions_container.h
index f3702c5aa560c5c1824198a68836a2d4c9d4e201..b2f7859b1e617bd7ffabb76e9e9bab5370e4e56d 100644
--- a/chrome/browser/ui/views/toolbar/browser_actions_container.h
+++ b/chrome/browser/ui/views/toolbar/browser_actions_container.h
@@ -187,6 +187,9 @@ class BrowserActionsContainer
   void ExecuteExtensionCommand(const extensions::Extension* extension,
                                const extensions::Command& command);
 
+  // Returns whether the given |accelerator| is registered by an extension.
+  bool IsExtensionCommandRegistered(const ui::Accelerator& accelerator);
+
   // Add or remove an observer.
   void AddObserver(BrowserActionsContainerObserver* observer);
   void RemoveObserver(BrowserActionsContainerObserver* observer);