Mac: Prevent NTP mousewheel events from being suppressed on Lion.

chrome/browser/platform_util.h

 // 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_PLATFORM_UTIL_H_
 #define CHROME_BROWSER_PLATFORM_UTIL_H_
 #pragma once
 
 #include <string>
 
@@ skipping 27 matching lines @@
 bool IsWindowActive(gfx::NativeWindow window);
 
 // Activate the window, bringing it to the foreground top level.
 void ActivateWindow(gfx::NativeWindow window);
 
 // Returns true if the view is visible. The exact definition of this is
 // platform-specific, but it is generally not "visible to the user", rather
 // whether the view has the visible attribute set.
 bool IsVisible(gfx::NativeView view);
 
+#if defined(OS_MACOSX)
+// On 10.7+, back and forward swipe gestures can be triggered using a scroll
+// gesture, if enabled in System Preferences. This function returns true if
+// the feature is supported and enabled, and false otherwise.
+bool IsSwipeTrackingFromScrollEventsEnabled();
+#endif
+
 }  // platform_util
 
 #endif  // CHROME_BROWSER_PLATFORM_UTIL_H_