rfw golden pixel customer test blocking engine -> framework roll

[zanderso]

Starting with #151594, which contains only Skia rolls.

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8742693942250287281/+/u/run_test.dart_for_customer_testing_shard_and_subshard_None/stdout

| 00:13 +41: /b/s/w/ir/x/t/flutter_customer_testing.flutter_packages.VLKIXZ/tests/packages/rfw/test/material_widgets_test.dart: Material widgets
| ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
| The following assertion was thrown while running async test code:
| Golden "goldens/material_test.scaffold.png": Pixel test failed, 0.00%, 4px diff detected.

And others.

cc @bdero @Hixie

[zanderso]

cc @goderbauer

[zanderso]

Maybe the pixel test could have a larger tolerance?

[Hixie]

fine by me. long term we should probably move to the "silver test" thing i'm working on, to avoid skia internals affecting this, though it does mean we'd stop catching a large class of potential regressions...

[zanderso]

@Hixie or @goderbauer are you able to make the change to make the test pass?

[zanderso]

I disabled the rfw tests in flutter/tests#386 and filed #151659 to re-enable them. Leaving this issue open to track the engine -> framework roll recovering.