Implement `direction` property (#906)
1<test name="margin_and_stretch_column__content_box_ltr" use-rounding="true">
2 <viewport width="max-content" height="max-content"/>
3 <input>
4 <div box-sizing="content-box" direction="ltr" flex-direction="column" width="100px" height="100px">
5 <div box-sizing="content-box" direction="ltr" flex-grow="1" margin-left="10px" margin-right="10px"/>
6 </div>
7 </input>
8 <expectations>
9 <node x="0" y="0" width="100" height="100">
10 <node x="10" y="0" width="80" height="100"/>
11 </node>
12 </expectations>
13</test>