[webkit-dev] PSA: Chromium layout test fallbacks AKA down with graphs, long live trees

[Ojan Vafai]

Sometime this week or next, we plan to change the Chromium layout test
fallback order. We'll be changing it so all chromium ports fallback to
platform/chromium, then to platform/mac. They will never fallback to
platform/win or platform/mac-* as they do today.

The benefits of this change are that it makes the fallback order much
easier to reason about for both human beings and code. I believe it makes
the fallback order for all WebKit ports a tree instead of a complex graph.
This will have minimal impact on the number of expected result files in the
tree since only a few hundred chromium tests currently fallback to
platform/win and/or platform/mac-*.

Ojan
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