add 'manipulation' support to CSS touch-action parsing.

Source/core/css/CSSComputedStyleDeclaration.cpp

Index: Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/Source/core/css/CSSComputedStyleDeclaration.cpp b/Source/core/css/CSSComputedStyleDeclaration.cpp
index bb0515186be9cc2c93ac91a3eeab92b56c4b33fc..959c6aa155ba1c90ab559acfbaf8704874340a40 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -1463,11 +1463,14 @@ static PassRefPtrWillBeRawPtr<CSSValue> touchActionFlagsToCSSValue(TouchAction t
         ASSERT(touchAction == TouchActionNone);
         list->append(cssValuePool().createIdentifierValue(CSSValueNone));
     }
-    if (touchAction & TouchActionPanX)
-        list->append(cssValuePool().createIdentifierValue(CSSValuePanX));
-    if (touchAction & TouchActionPanY)
-        list->append(cssValuePool().createIdentifierValue(CSSValuePanY));
-
+    if (touchAction == (TouchActionPanX | TouchActionPanY | TouchActionPinchZoom)) {
+        list->append(cssValuePool().createIdentifierValue(CSSValueManipulation));
+    } else {
+        if (touchAction & TouchActionPanX)
+            list->append(cssValuePool().createIdentifierValue(CSSValuePanX));
+        if (touchAction & TouchActionPanY)
+            list->append(cssValuePool().createIdentifierValue(CSSValuePanY));
+    }
     ASSERT(list->length());
     return list.release();
 }