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

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 577decf195e9043c96a7e83b2a9b81c09a2f3bb6..92999ba57a9642dbb6af802886cbaff39fc1ea5f 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -568,4 +568,16 @@ willPositionSheet:(NSWindow*)sheet
   return [defaults boolForKey:@"AppleEnableSwipeNavigateWithScrolls"];
 }
 
+- (BOOL)isScrollDirectionInverted {

[Nico, 2011/07/26 15:00:18]

Can you move this and the previous function to somewhere else? Chances are we'll
need this somewhere else as well, and it keeps this file smaller.

[Robert Sesek, 2011/07/26 15:56:05]

Done.

+  if (!base::mac::IsOSLionOrLater())
+    return NO;
+
+  NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
+  // The defaults must be synchronized here otherwise a stale value will be
+  // returned for an indeterminante amount of time. For some reason, this is
+  // not necessary in |-recognizeTwoFingerGestures|.
+  [defaults synchronize];
+  return [defaults boolForKey:@"com.apple.swipescrolldirection"];
+}
+
 @end  // @implementation BrowserWindowController(Private)