fix for 27454 - Fade out close button state on mouse exit

chrome/browser/ui/cocoa/animation_utils.h

Index: chrome/browser/ui/cocoa/animation_utils.h
diff --git a/chrome/browser/ui/cocoa/animation_utils.h b/chrome/browser/ui/cocoa/animation_utils.h
index 3a34e0eb8a8d09f4d3da9fb996c7055382a6696d..5ed7ffa09fa895e20e1d10d239bf8406c405bf15 100644
--- a/chrome/browser/ui/cocoa/animation_utils.h
+++ b/chrome/browser/ui/cocoa/animation_utils.h
@@ -31,5 +31,32 @@ class WithNoAnimation {
   }
 };
 
+// Disables actions within a scope.
+class ScopedCAActionDisabler {
+ public:
+  ScopedCAActionDisabler() {
+    [CATransaction begin];
+    [CATransaction setValue:[NSNumber numberWithBool:YES]
+                     forKey:kCATransactionDisableActions];
+  }
+
+  ~ScopedCAActionDisabler() {
+    [CATransaction commit];
+  }
+};
+
+// Sets a duration on actions within a scope.
+class ScopedCAActionSetDuration {
+ public:
+  explicit ScopedCAActionSetDuration(NSTimeInterval duration) {
+    [CATransaction begin];
+    [CATransaction setValue:[NSNumber numberWithFloat:duration]
+                     forKey:kCATransactionAnimationDuration];
+  }
+
+  ~ScopedCAActionSetDuration() {
+    [CATransaction commit];
+  }
+};
 
 #endif // CHROME_BROWSER_UI_COCOA_ANIMATION_UTILS_H