Implement `direction` property (#906)
1<test name="gap_column_gap_flexible__content_box_rtl" use-rounding="true">
2 <viewport width="max-content" height="max-content"/>
3 <input>
4 <div box-sizing="content-box" direction="rtl" width="80px" height="100px" row-gap="20px" column-gap="10px">
5 <div box-sizing="content-box" direction="rtl" flex-grow="1" flex-basis="0%"/>
6 <div box-sizing="content-box" direction="rtl" flex-grow="1" flex-basis="0%"/>
7 <div box-sizing="content-box" direction="rtl" flex-grow="1" flex-basis="0%"/>
8 </div>
9 </input>
10 <expectations>
11 <node x="0" y="0" width="80" height="100">
12 <node x="60" y="0" width="20" height="100"/>
13 <node x="30" y="0" width="20" height="100"/>
14 <node x="0" y="0" width="20" height="100"/>
15 </node>
16 </expectations>
17</test>