[css3-text] Implement text-decoration property shorthand

Source/core/css/CSSShorthands.in

 // This file contains all the mapping shorthands <-> longhands and generate
 // the appropriate code to handle them in core. First column is the shorthand name
 // followed by the longhands associated to the shorthand.
 // Note: Mandatory blank line to skip parameter parsing phase
 
 background longhands=background-image;background-position-x;background-position-y;background-size;background-repeat-x;background-repeat-y;background-attachment;background-origin;background-clip;background-color
 background-position longhands=background-position-x;background-position-y
 background-repeat longhands=background-repeat-x;background-repeat-y
 border longhands=border-top-color;border-top-style;border-top-width;border-right-color;border-right-style;border-right-width;border-bottom-color;border-bottom-style;border-bottom-width;border-left-color;border-left-style;border-left-width
 border-bottom longhands=border-bottom-width;border-bottom-style;border-bottom-color
@@ skipping 12 matching lines @@
 grid-area longhands=grid-row-start;grid-column-start;grid-row-end;grid-column-end
 grid-column longhands=grid-column-start;grid-column-end
 grid-row longhands=grid-row-start;grid-row-end
 height longhands=min-height;max-height
 list-style longhands=list-style-type;list-style-position;list-style-image
 margin longhands=margin-top;margin-right;margin-bottom;margin-left
 marker longhands=marker-start;marker-mid;marker-end
 outline longhands=outline-color;outline-style;outline-width
 overflow longhands=overflow-x;overflow-y
 padding longhands=padding-top;padding-right;padding-bottom;padding-left
+text-decoration longhands=text-decoration-line;text-decoration-style;text-decoration-color
 transition longhands=transition-property;transition-duration;transition-timing-function;transition-delay
 -webkit-animation longhands=-webkit-animation-name;-webkit-animation-duration;-webkit-animation-timing-function;-webkit-animation-delay;-webkit-animation-iteration-count;-webkit-animation-direction;-webkit-animation-fill-mode
 -webkit-border-after longhands=-webkit-border-after-width;-webkit-border-after-style;-webkit-border-after-color
 -webkit-border-before longhands=-webkit-border-before-width;-webkit-border-before-style;-webkit-border-before-color
 -webkit-border-end longhands=-webkit-border-end-width;-webkit-border-end-style;-webkit-border-end-color
 -webkit-border-start longhands=-webkit-border-start-width;-webkit-border-start-style;-webkit-border-start-color
 -webkit-border-radius longhands=border-top-left-radius;border-top-right-radius;border-bottom-right-radius;border-bottom-left-radius
 -webkit-columns longhands=-webkit-column-width;-webkit-column-count
 -webkit-column-rule longhands=-webkit-column-rule-width;-webkit-column-rule-style;-webkit-column-rule-color
 -webkit-margin-collapse longhands=-webkit-margin-before-collapse;-webkit-margin-after-collapse
 -webkit-marquee longhands=-webkit-marquee-direction;-webkit-marquee-increment;-webkit-marquee-repetition;-webkit-marquee-style;-webkit-marquee-speed
 -webkit-mask longhands=-webkit-mask-image;-webkit-mask-position-x;-webkit-mask-position-y;-webkit-mask-size;-webkit-mask-repeat-x;-webkit-mask-repeat-y;-webkit-mask-origin;-webkit-mask-clip
 -webkit-mask-position longhands=-webkit-mask-position-x;-webkit-mask-position-y
 -webkit-mask-repeat longhands=-webkit-mask-repeat-x;-webkit-mask-repeat-y
 -webkit-text-emphasis longhands=-webkit-text-emphasis-style;-webkit-text-emphasis-color
 -webkit-text-stroke longhands=-webkit-text-stroke-width;-webkit-text-stroke-color
 -webkit-transition longhands=-webkit-transition-property;-webkit-transition-duration;-webkit-transition-timing-function;-webkit-transition-delay
 -webkit-transform-origin longhands=-webkit-transform-origin-x;-webkit-transform-origin-y;-webkit-transform-origin-z
 width longhands=min-width;max-width