Auto merge of #11417 - stshine:flex-longhand-properties, r=mbrubeck

Support remaining longhand flexbox style properties for servo

- [x] `./mach build -d` does not report any errors
- [X] `./mach test-tidy --faster` does not report any errors
- [X] There are tests for these changes

Add the remaining longhand CSS properties of flexbox for servo,
including `flex-wrap`, `flex-grow`, `flex-shrink`, `justify-content`,
`align-items`, `align-self` and `align-content`.

Tests for the remaining longhand properties are also enabled. Test for
default value of `align-self` is modified because the new default value
for this property is "auto" is current flexbox CR.

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components/layout/incremental.rs

@@ -220,8 +220,15 @@ pub fn compute_damage(old: Option<&Arc<ServoComputedValues>>, new: &ServoCompute
         get_inheritedtable.border_spacing,
         get_column.column_gap,
         get_position.flex_direction,
+        get_position.flex_wrap,
+        get_position.justify_content,
+        get_position.align_items,
+        get_position.align_content,
+        get_position.order,
         get_position.flex_basis,
-        get_position.order
+        get_position.flex_grow,
+        get_position.flex_shrink,
+        get_position.align_self
     ]) || add_if_not_equal!(old, new, damage,
                             [ REPAINT, STORE_OVERFLOW, REFLOW_OUT_OF_FLOW ], [
         get_position.top, get_position.left,