Encode/Decode tooltip in CPView

AppKit/CPView.j

@@ -2707,6 +2707,7 @@ var CPViewAutoresizingMaskKey       = @"CPViewAutoresizingMask",
     CPViewBoundsKey                 = @"CPViewBoundsKey",
     CPViewFrameKey                  = @"CPViewFrameKey",
     CPViewHitTestsKey               = @"CPViewHitTestsKey",
+    CPViewToolTipKey                = @"CPViewToolTipKey",
     CPViewIsHiddenKey               = @"CPViewIsHiddenKey",
     CPViewOpacityKey                = @"CPViewOpacityKey",
     CPViewSubviewsKey               = @"CPViewSubviewsKey",
@@ -2763,6 +2764,10 @@ var CPViewAutoresizingMaskKey       = @"CPViewAutoresizingMask",
 
         _hitTests = ![aCoder containsValueForKey:CPViewHitTestsKey] || [aCoder decodeBoolForKey:CPViewHitTestsKey];
 
+#if PLATFORM(DOM)
+        [self setToolTip:[aCoder decodeObjectForKey:CPViewToolTipKey]];
+#endif
+
         // DOM SETUP
 #if PLATFORM(DOM)
         _DOMImageParts = [];
@@ -2870,6 +2875,9 @@ var CPViewAutoresizingMaskKey       = @"CPViewAutoresizingMask",
     if (_isHidden)
         [aCoder encodeBool:_isHidden forKey:CPViewIsHiddenKey];
 
+    if (_toolTip)
+        [aCoder encodeObject:_toolTip forKey:CPViewToolTipKey];
+
     var nextKeyView = [self nextKeyView];
 
     if (nextKeyView !== nil && ![nextKeyView isEqual:self])