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

chrome/browser/platform_util.h

Index: chrome/browser/platform_util.h
diff --git a/chrome/browser/platform_util.h b/chrome/browser/platform_util.h
index 69ecf986708ae76489ca128366b212d375c80e6f..d707eab89cead625066ce2902433c9d0d3361cff 100644
--- a/chrome/browser/platform_util.h
+++ b/chrome/browser/platform_util.h
@@ -45,6 +45,13 @@ void ActivateWindow(gfx::NativeWindow window);
 // 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_