[css-grid] Implement grid gutters

third_party/WebKit/Source/core/css/CSSProperties.in

 // This file specifies all the CSS properties we support and the necessary
 // information for our code generation. The various supported arguments
 // are described below with example usage
 
 
 // - alias_for=other-property
 // Properties specifying alias_for should be virtually identical to the
 // properties they alias. Minor parsing differences are allowed as long as
 // the CSSValues created are of the same format of the aliased property.
 
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 flex-wrap
 float type_name=EFloat, name_for_methods=Floating
 flood-color interpolable, svg, converter=convertColor
 flood-opacity interpolable, svg, converter=convertNumberOrPercentage
 glyph-orientation-horizontal inherited, svg, converter=convertGlyphOrientation
 glyph-orientation-vertical inherited, svg, custom_value
 grid-auto-columns runtime_flag=CSSGridLayout, converter=convertGridTrackSize
 grid-auto-flow runtime_flag=CSSGridLayout, converter=convertGridAutoFlow
 grid-auto-rows runtime_flag=CSSGridLayout, converter=convertGridTrackSize
 grid-column-end runtime_flag=CSSGridLayout, converter=convertGridPosition
+grid-column-gap runtime_flag=CSSGridLayout, converter=convertLength
 grid-column-start runtime_flag=CSSGridLayout, converter=convertGridPosition
 grid-row-end runtime_flag=CSSGridLayout, converter=convertGridPosition
+grid-row-gap runtime_flag=CSSGridLayout, converter=convertLength
 grid-row-start runtime_flag=CSSGridLayout, converter=convertGridPosition
 grid-template-areas runtime_flag=CSSGridLayout, custom_all
 grid-template-columns runtime_flag=CSSGridLayout, custom_all
 grid-template-rows runtime_flag=CSSGridLayout, custom_all
 height interpolable, initial=initialSize, converter=convertLengthSizing
 image-rendering inherited
 image-orientation runtime_flag=ImageOrientation, inherited, name_for_methods=RespectImageOrientation, converter=convertImageOrientation
 isolation runtime_flag=CSSCompositing
 justify-content initial=initialContentAlignment, converter=convertContentAlignmentData
 justify-items runtime_flag=CSSGridLayout, initial=initialSelfAlignment, converter=convertSelfOrDefaultAlignmentData
@@ skipping 252 matching lines @@
 border-spacing longhands=-webkit-border-horizontal-spacing;-webkit-border-vertical-spacing
 border-style longhands=border-top-style;border-right-style;border-bottom-style;border-left-style
 border-top longhands=border-top-width;border-top-style;border-top-color
 border-width longhands=border-top-width;border-right-width;border-bottom-width;border-left-width
 flex longhands=flex-grow;flex-shrink;flex-basis
 flex-flow longhands=flex-direction;flex-wrap
 font longhands=font-style;font-variant;font-weight;font-stretch;font-size;line-height;font-family
 grid runtime_flag=CSSGridLayout, longhands=grid-template-columns;grid-template-rows;grid-template-areas;grid-auto-flow;grid-auto-columns;grid-auto-rows
 grid-area runtime_flag=CSSGridLayout, longhands=grid-row-start;grid-column-start;grid-row-end;grid-column-end
 grid-column runtime_flag=CSSGridLayout, longhands=grid-column-start;grid-column-end
+grid-gap runtime_flag=CSSGridLayout, longhands=grid-column-gap;grid-row-gap
 grid-row runtime_flag=CSSGridLayout, longhands=grid-row-start;grid-row-end
 grid-template runtime_flag=CSSGridLayout, longhands=grid-template-columns;grid-template-rows;grid-template-areas
 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
 motion runtime_flag=CSSMotionPath, longhands=motion-path;motion-offset;motion-rotation
 outline longhands=outline-color;outline-style;outline-width
 overflow longhands=overflow-x;overflow-y
 padding longhands=padding-top;padding-right;padding-bottom;padding-left
 transition longhands=transition-property;transition-duration;transition-timing-function;transition-delay
@@ skipping 61 matching lines @@
 -webkit-shape-margin alias_for=shape-margin
 -webkit-shape-outside alias_for=shape-outside
 -webkit-transform alias_for=transform
 -webkit-transform-origin alias_for=transform-origin
 -webkit-transform-style alias_for=transform-style
 -webkit-transition alias_for=transition
 -webkit-transition-delay alias_for=transition-delay
 -webkit-transition-duration alias_for=transition-duration
 -webkit-transition-property alias_for=transition-property
 -webkit-transition-timing-function alias_for=transition-timing-function