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diff --git a/chrome/browser/ui/cocoa/test_event_utils.h b/chrome/browser/ui/cocoa/test_event_utils.h
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+// Copyright (c) 2010 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_TEST_EVENT_UTILS_H_
+#define CHROME_BROWSER_UI_COCOA_TEST_EVENT_UTILS_H_
+#pragma once
+
+#include <utility>
+
+#import <objc/objc-class.h>
+
+#include "base/basictypes.h"
+
+// Within a given scope, replace the selector |selector| on |target| with that
+// from |source|.
+class ScopedClassSwizzler {
+ public:
+  ScopedClassSwizzler(Class target, Class source, SEL selector);
+  ~ScopedClassSwizzler();
+
+ private:
+  Method old_selector_impl_;
+  Method new_selector_impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedClassSwizzler);
+};
+
+namespace test_event_utils {
+
+// Create synthetic mouse events for testing. Currently these are very
+// basic, flesh out as needed.  Points are all in window coordinates;
+// where the window is not specified, coordinate system is undefined
+// (but will be repeated when the event is queried).
+NSEvent* MakeMouseEvent(NSEventType type, NSUInteger modifiers);
+NSEvent* MouseEventAtPoint(NSPoint point, NSEventType type,
+                           NSUInteger modifiers);
+NSEvent* LeftMouseDownAtPoint(NSPoint point);
+NSEvent* LeftMouseDownAtPointInWindow(NSPoint point, NSWindow* window);
+
+// Return a mouse down and an up event with the given |clickCount| at
+// |view|'s midpoint.
+std::pair<NSEvent*, NSEvent*> MouseClickInView(NSView* view,
+                                               NSUInteger clickCount);
+
+}  // namespace test_event_utils
+
+#endif  // CHROME_BROWSER_UI_COCOA_TEST_EVENT_UTILS_H_