Bug 1179393: Add support for -webkit-border-image longhand CSS properties, as aliases (behind a pref). r=heycam

Specifically, this patch adds support for these longhand properties:
-webkit-border-image-outset
-webkit-border-image-repeat
-webkit-border-image-slice
-webkit-border-image-source
-webkit-border-image-width

layout/style/nsCSSPropAliasList.h

@@ -296,10 +296,32 @@ CSS_PROP_ALIAS(-webkit-background-size,
                background_size,
                WebkitBackgroundSize,
                WEBKIT_PREFIX_PREF)
+
 CSS_PROP_ALIAS(-webkit-border-image,
                border_image,
                WebkitBorderImage,
                WEBKIT_PREFIX_PREF)
+CSS_PROP_ALIAS(-webkit-border-image-outset,
+               border_image_outset,
+               WebkitBorderImageOutset,
+               WEBKIT_PREFIX_PREF)
+CSS_PROP_ALIAS(-webkit-border-image-repeat,
+               border_image_repeat,
+               WebkitBorderImageRepeat,
+               WEBKIT_PREFIX_PREF)
+CSS_PROP_ALIAS(-webkit-border-image-slice,
+               border_image_slice,
+               WebkitBorderImageSlice,
+               WEBKIT_PREFIX_PREF)
+CSS_PROP_ALIAS(-webkit-border-image-source,
+               border_image_source,
+               WebkitBorderImageSource,
+               WEBKIT_PREFIX_PREF)
+CSS_PROP_ALIAS(-webkit-border-image-width,
+               border_image_width,
+               WebkitBorderImageWidth,
+               WEBKIT_PREFIX_PREF)
+
 CSS_PROP_ALIAS(-webkit-box-shadow,
                box_shadow,
                WebkitBoxShadow,

layout/style/test/property_database.js

@@ -6664,6 +6664,41 @@ if (IsCSSPropertyPrefEnabled("layout.css.prefixes.webkit")) {
     alias_for: "border-image",
     subproperties: [ "border-image-source", "border-image-slice", "border-image-width",  "border-image-outset", "border-image-repeat" ],
   };
+  gCSSProperties["-webkit-border-image-outset"] = {
+    domProp: "webkitBorderImageOutset",
+    inherited: false,
+    type: CSS_TYPE_SHORTHAND_AND_LONGHAND,
+    alias_for: "border-image-outset",
+    subproperties: [ "border-image-outset" ],
+  };
+  gCSSProperties["-webkit-border-image-repeat"] = {
+    domProp: "webkitBorderImageRepeat",
+    inherited: false,
+    type: CSS_TYPE_SHORTHAND_AND_LONGHAND,
+    alias_for: "border-image-repeat",
+    subproperties: [ "border-image-repeat" ],
+  };
+  gCSSProperties["-webkit-border-image-slice"] = {
+    domProp: "webkitBorderImageSlice",
+    inherited: false,
+    type: CSS_TYPE_SHORTHAND_AND_LONGHAND,
+    alias_for: "border-image-slice",
+    subproperties: [ "border-image-slice" ],
+  };
+  gCSSProperties["-webkit-border-image-source"] = {
+    domProp: "webkitBorderImageSource",
+    inherited: false,
+    type: CSS_TYPE_SHORTHAND_AND_LONGHAND,
+    alias_for: "border-image-source",
+    subproperties: [ "border-image-source" ],
+  };
+  gCSSProperties["-webkit-border-image-width"] = {
+    domProp: "webkitBorderImageWidth",
+    inherited: false,
+    type: CSS_TYPE_SHORTHAND_AND_LONGHAND,
+    alias_for: "border-image-width",
+    subproperties: [ "border-image-width" ],
+  };
   gCSSProperties["-webkit-box-shadow"] = {
     domProp: "webkitBoxShadow",
     inherited: false,