Implement `direction` property (#906)
1<test name="padding_flex_child__content_box_ltr" use-rounding="true">
2 <viewport width="max-content" height="max-content"/>
3 <input>
4 <div box-sizing="content-box" direction="ltr" width="100px" height="100px" padding-top="10px" padding-left="10px" padding-bottom="10px" padding-right="10px">
5 <div box-sizing="content-box" direction="ltr" flex-grow="1" width="10px"/>
6 </div>
7 </input>
8 <expectations>
9 <node x="0" y="0" width="120" height="120">
10 <node x="10" y="10" width="100" height="100"/>
11 </node>
12 </expectations>
13</test>