Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/browser/ui/browser_window.h

Index: chrome/browser/ui/browser_window.h
diff --git a/chrome/browser/ui/browser_window.h b/chrome/browser/ui/browser_window.h
index 880f6e8adf69af76bec3fa32f86c0ddd61b4a09d..e83a1fc2ddd41f0cd0cf67a03afed5609c55a211 100644
--- a/chrome/browser/ui/browser_window.h
+++ b/chrome/browser/ui/browser_window.h
@@ -16,6 +16,7 @@
 #include "chrome/browser/ui/sync/one_click_signin_sync_starter.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/translate/core/common/translate_errors.h"
+#include "ui/base/accelerators/accelerator.h"
 #include "ui/base/base_window.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/native_widget_types.h"
@@ -402,6 +403,10 @@ class BrowserWindow : public ui::BaseWindow {
   virtual void ExecuteExtensionCommand(const extensions::Extension* extension,
                                        const extensions::Command& command) = 0;
 
+  // Returns if the given |accelerator| is registered by an extension.

[Finnur, 2014/09/10 10:15:16]

nit: s/if/whether/

[David Tseng, 2014/09/10 21:19:07]

Done.

+  virtual bool IsExtensionCommandRegistered(
+      const ui::Accelerator& accelerator) = 0;
+
  protected:
   friend class BrowserCloseManager;
   friend class BrowserView;