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diff --git a/content/common/chrome_application_mac.h b/content/common/chrome_application_mac.h
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+// Copyright (c) 2011 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 CONTENT_COMMON_CHROME_APPLICATION_MAC_H_
+#define CONTENT_COMMON_CHROME_APPLICATION_MAC_H_
+#pragma once
+
+#if defined(__OBJC__)
+
+#import <AppKit/AppKit.h>
+
+#include "base/basictypes.h"
+#include "base/message_pump_mac.h"
+#include "base/scoped_nsobject.h"
+
+// Event hooks must implement this protocol.
+@protocol CrApplicationEventHookProtocol
+- (void)hookForEvent:(NSEvent*)theEvent;
+@end
+
+
+@interface CrApplication : NSApplication<CrAppProtocol> {
+ @private
+  BOOL handlingSendEvent_;
+  // Array of objects implementing the CrApplicationEventHookProtocol
+  scoped_nsobject<NSMutableArray> eventHooks_;
+}
+- (BOOL)isHandlingSendEvent;
+
+// Add or remove an event hook to be called for every sendEvent:
+// that the application receives.  These handlers are called before
+// the normal [NSApplication sendEvent:] call is made.
+
+// This is not a good alternative to a nested event loop.  It should
+// be used only when normal event logic and notification breaks down
+// (e.g. when clicking outside a canBecomeKey:NO window to "switch
+// context" out of it).
+- (void)addEventHook:(id<CrApplicationEventHookProtocol>)hook;
+- (void)removeEventHook:(id<CrApplicationEventHookProtocol>)hook;
+
++ (NSApplication*)sharedApplication;
+@end
+
+namespace chrome_application_mac {
+
+// Controls the state of |handlingSendEvent_| in the event loop so that it is
+// reset properly.
+class ScopedSendingEvent {
+ public:
+  ScopedSendingEvent();
+  ~ScopedSendingEvent();
+
+ private:
+  CrApplication* app_;
+  BOOL handling_;
+  DISALLOW_COPY_AND_ASSIGN(ScopedSendingEvent);
+};
+
+}  // namespace chrome_application_mac
+
+#endif  // defined(__OBJC__)
+
+namespace chrome_application_mac {
+
+// To be used to instantiate CrApplication from C++ code.
+void RegisterCrApp();
+
+}  // namespace chrome_application_mac
+
+#endif  // CONTENT_COMMON_CHROME_APPLICATION_MAC_H_