Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/browser/ui/cocoa/browser_window_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C controller for the Browser
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single toolbar and, by virtue of being a
@@ skipping 347 matching lines @@
 
 // Called when the Add Search Engine dialog is closed.
 - (void)sheetDidEnd:(NSWindow*)sheet
          returnCode:(NSInteger)code
             context:(void*)context;
 
 // Executes the command registered by the extension that has the given id.
 - (void)executeExtensionCommand:(const std::string&)extension_id
                         command:(const extensions::Command&)command;
 
+- (BOOL)isExtensionCommandRegisteredForAccelerator:
+    (const ui::Accelerator&)accelerator;
+
 @end  // @interface BrowserWindowController
 
 
 // Methods having to do with the window type (normal/popup/app, and whether the
 // window has various features; fullscreen and presentation mode methods are
 // separate).
 @interface BrowserWindowController(WindowType)
 
 // Determines whether this controller's window supports a given feature (i.e.,
 // whether a given feature is or can be shown in the window).
@@ skipping 197 matching lines @@
 // positioned relative to.
 - (NSRect)omniboxPopupAnchorRect;
 
 // Force a layout of info bars.
 - (void)layoutInfoBars;
 
 @end  // @interface BrowserWindowController (TestingAPI)
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_