layout: Avoid layout sometimes when stretching (#33967)

This is the second flexbox caching change. It seeks to detect when a
relayout can be avoided in the case of a stretching flex item. This
heuristic can be combined, because currently we still do relayout
sometimes when we do not need to.

For instance currently we always relayout when a flex child is itself a
column flex. This only needs to happen when the grandchildren themselves
grow or shrink. That optimization is perhaps a lower priority as
`flex-grow: 0 / flex-shrink: 1` is the default behavior for flex.

Since this change means we more consistenly zero out the percentage part
of `calc` expressions when they have circular dependencies, this causes one
test to start failing (`/css/css-values/calc-min-height-block-1.html`).
This is related to w3c/csswg-drafts#10969, which is pending on further
discussion in the working group.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>

components/layout_2020/formatting_contexts.rs

@@ -90,6 +90,9 @@ pub(crate) struct IndependentLayout {
     /// there was one. This is used to propagate baselines to the ancestors of `display:
     /// inline-block`.
     pub baselines: Baselines,
+
+    /// Whether or not this layout depends on the containing block size.
+    pub depends_on_block_constraints: bool,
 }
 
 pub(crate) struct IndependentLayoutResult {