[Mac] Respect natural/inverted scroll direction on Lion when gesturing.

chrome/browser/ui/cocoa/gesture_utils.h

Index: chrome/browser/ui/cocoa/gesture_utils.h
diff --git a/chrome/browser/ui/cocoa/gesture_utils.h b/chrome/browser/ui/cocoa/gesture_utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..83c630c8fc39a5cbf97fe5e0094228b81a089472
--- /dev/null
+++ b/chrome/browser/ui/cocoa/gesture_utils.h
@@ -0,0 +1,22 @@
+// 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 CHROME_BROWSER_UI_COCOA_GESTURE_UTILS_H_
+#define CHROME_BROWSER_UI_COCOA_GESTURE_UTILS_H_
+
+#include <Foundation/Foundation.h>

[Mark Mentovai, 2011/07/26 18:26:26]

Don’t need this if you use bool below. Then this file is accessible from C++.

+
+namespace gesture_utils {
+
+// On Lion, Apple introduced a new gesture for navigating pages using two-finger
+// gestures. Returns YES if two-finger gestures should be recognized.
+BOOL RecognizeTwoFingerGestures();
+
+// On Lion, returns YES if the scroll direction is "natural"/inverted. All other
+// OSes will return NO.
+BOOL IsScrollDirectionInverted();
+
+}  // namespace gesture_utils
+
+#endif  // CHROME_BROWSER_UI_COCOA_GESTURE_UTILS_H_