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diff --git a/chrome/browser/cocoa/chrome_event_processing_window.mm b/chrome/browser/cocoa/chrome_event_processing_window.mm
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+++ b/chrome/browser/cocoa/chrome_event_processing_window.mm
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+// Copyright (c) 2009 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.
+
+#import "chrome/browser/cocoa/chrome_event_processing_window.h"
+
+#include "base/logging.h"
+#import "chrome/browser/cocoa/browser_window_controller.h"
+#import "chrome/browser/cocoa/browser_frame_view.h"
+#import "chrome/browser/cocoa/tab_strip_controller.h"
+#import "chrome/browser/renderer_host/render_widget_host_view_mac.h"
+#include "chrome/browser/global_keyboard_shortcuts_mac.h"
+
+typedef int (*KeyToCommandMapper)(bool, bool, bool, int);
+
+@implementation ChromeEventProcessingWindow
+
+- (BOOL)handleExtraKeyboardShortcut:(NSEvent*)event fromTable:
+    (KeyToCommandMapper)commandForKeyboardShortcut {
+  // Extract info from |event|.
+  NSUInteger modifers = [event modifierFlags];
+  const bool cmdKey = modifers & NSCommandKeyMask;
+  const bool shiftKey = modifers & NSShiftKeyMask;
+  const bool cntrlKey = modifers & NSControlKeyMask;
+  const int keyCode = [event keyCode];
+
+  int cmdNum = commandForKeyboardShortcut(cmdKey, shiftKey, cntrlKey,
+      keyCode);
+
+  BrowserWindowController* controller =
+      (BrowserWindowController*)[self delegate];
+  // A bit of sanity.
+  DCHECK([controller isKindOfClass:[BrowserWindowController class]]);
+  DCHECK([controller respondsToSelector:@selector(executeCommand:)]);
+
+  if (cmdNum != -1) {
+    [controller executeCommand:cmdNum];
+    return YES;
+  }
+  return NO;
+}
+
+- (BOOL)handleExtraWindowKeyboardShortcut:(NSEvent*)event {
+  return [self handleExtraKeyboardShortcut:event
+                                 fromTable:CommandForWindowKeyboardShortcut];
+}
+
+- (BOOL)handleExtraBrowserKeyboardShortcut:(NSEvent*)event {
+  return [self handleExtraKeyboardShortcut:event
+                                 fromTable:CommandForBrowserKeyboardShortcut];
+}
+
+- (BOOL)performKeyEquivalent:(NSEvent*)event {
+  // Give the web site a chance to handle the event. If it doesn't want to
+  // handle it, it will call us back with one of the |handle*| methods above.
+  NSResponder* r = [self firstResponder];
+  if ([r isKindOfClass:[RenderWidgetHostViewCocoa class]])
+    return [r performKeyEquivalent:event];
+
+  // Handle per-window shortcuts like cmd-1, but do not handle browser-level
+  // shortcuts like cmd-left (else, cmd-left would do history navigation even
+  // if e.g. the Omnibox has focus).
+  if ([self handleExtraWindowKeyboardShortcut:event])
+    return YES;
+  return [super performKeyEquivalent:event];
+}
+
+@end  // ChromeEventProcessingWindow
+