Add CSS parser support for break-after, break-before and break-inside.

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.
 
@@ skipping 135 matching lines @@
 border-right-style type_name=EBorderStyle, initial=initialBorderStyle
 border-right-width interpolable, initial=initialBorderWidth, converter=convertLineWidth<unsigned>
 border-top-color interpolable, custom_all
 border-top-left-radius interpolable, initial=initialBorderRadius, converter=convertRadius
 border-top-right-radius interpolable, initial=initialBorderRadius, converter=convertRadius
 border-top-style type_name=EBorderStyle, initial=initialBorderStyle
 border-top-width interpolable, initial=initialBorderWidth, converter=convertLineWidth<unsigned>
 bottom interpolable, initial=initialOffset, converter=convertLengthOrAuto
 box-shadow interpolable, converter=convertShadow
 box-sizing
+break-after type_name=EBreak, initial=initialBreakAfter
+break-before type_name=EBreak, initial=initialBreakBefore
+break-inside type_name=EBreak, initial=initialBreakInside
 buffered-rendering svg
 caption-side inherited
 clear
 clip interpolable, converter=convertClip, custom_all
 clip-path svg, name_for_methods=ClipperResource, converter=convertFragmentIdentifier
 clip-rule inherited, svg, type_name=WindRule
 color-interpolation inherited, svg
 color-interpolation-filters inherited, svg, type_name=EColorInterpolation
 color-rendering inherited, svg
 column-fill runtime_flag=ColumnFill, type_name=ColumnFill
@@ skipping 73 matching lines @@
 outline-offset interpolable, converter=convertComputedLength<int>
 outline-style custom_all
 outline-width interpolable, converter=convertLineWidth<unsigned short>
 overflow-wrap inherited
 overflow-x type_name=EOverflow
 overflow-y type_name=EOverflow
 padding-bottom interpolable, initial=initialPadding, converter=convertLength
 padding-left interpolable, initial=initialPadding, converter=convertLength
 padding-right interpolable, initial=initialPadding, converter=convertLength
 padding-top interpolable, initial=initialPadding, converter=convertLength
-page-break-after type_name=EPageBreak, initial=initialPageBreak
-page-break-before type_name=EPageBreak, initial=initialPageBreak
-page-break-inside type_name=EPageBreak, initial=initialPageBreak
 paint-order inherited, svg, converter=convertPaintOrder
 perspective interpolable, converter=convertPerspective
 perspective-origin interpolable, converter=convertPosition
 pointer-events inherited
 position
 quotes inherited, converter=convertQuotes
 resize custom_value
 right interpolable, initial=initialOffset, converter=convertLengthOrAuto
 r interpolable, svg, converter=convertLength
 rx interpolable, svg, converter=convertLength
@@ skipping 67 matching lines @@
 -webkit-box-decoration-break
 -webkit-box-direction inherited
 -webkit-box-flex type_name=float
 -webkit-box-flex-group type_name=unsigned int
 -webkit-box-lines
 -webkit-box-ordinal-group type_name=unsigned int
 -webkit-box-orient
 -webkit-box-pack
 -webkit-box-reflect converter=convertBoxReflect
 -webkit-clip-path interpolable, custom_value
--webkit-column-break-after type_name=EPageBreak, initial=initialPageBreak
--webkit-column-break-before type_name=EPageBreak, initial=initialPageBreak
--webkit-column-break-inside type_name=EPageBreak, initial=initialPageBreak
 -webkit-column-count interpolable, type_name=unsigned short, custom_all
 -webkit-column-gap interpolable, converter=convertComputedLength<float>, custom_all
 -webkit-column-rule-color interpolable, custom_all
 -webkit-column-rule-style type_name=EBorderStyle, initial=initialBorderStyle
 -webkit-column-rule-width interpolable, converter=convertLineWidth<unsigned short>
 -webkit-column-span type_name=ColumnSpan
 -webkit-column-width interpolable, converter=convertComputedLength<float>, custom_all
 -webkit-filter interpolable, converter=convertFilterOperations
 -webkit-highlight inherited, converter=convertString<CSSValueNone>
 -webkit-hyphenate-character inherited, name_for_methods=HyphenationString, converter=convertString<CSSValueAuto>
@@ skipping 117 matching lines @@
 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 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
+page-break-after longhands=break-after
+page-break-before longhands=break-before
+page-break-inside longhands=break-inside
 transition longhands=transition-property;transition-duration;transition-timing-function;transition-delay
 -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-column-break-after longhands=break-after
+-webkit-column-break-before longhands=break-before
+-webkit-column-break-inside longhands=break-inside
 -webkit-column-rule longhands=-webkit-column-rule-width;-webkit-column-rule-style;-webkit-column-rule-color
 -webkit-columns longhands=-webkit-column-width;-webkit-column-count
 -webkit-margin-collapse longhands=-webkit-margin-before-collapse;-webkit-margin-after-collapse
 -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-box-image longhands=-webkit-mask-box-image-source;-webkit-mask-box-image-slice;-webkit-mask-box-image-width;-webkit-mask-box-image-outset;-webkit-mask-box-image-repeat
 -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
 
@@ skipping 48 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