Added navigator.pointerEnabled behind a flag for experiment.

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index c6eac9d3e1da8819bdf224de921c71a44322f8ba..7662a66d2378dc70b1a6a8bbd418d63d38e67545 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -387,6 +387,9 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::V8SVGSVGElement_Viewport_AttributeGetter:
         return willBeRemoved("SVGSVGElement.viewport", 55, "5686865248124928");
 
+    case UseCounter::NavigatorPointerEnabled:
+        return "Navigator.pointerEnabled is a non-standard API added for experiments only. It will be removed in near future.";
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();