Bug 1676495 [wpt PR 26475] - Improve will-change:transform raster scale adjustment...

Bug 1676495 [wpt PR 26475] - Improve will-change:transform raster scale adjustment, a=testonly

Automatic update from web-platform-tests
Improve will-change:transform raster scale adjustment

This fixes the issue of too big scale for will-change:transform layers
by
- Partly reverting crrev.com/c/2447650 to apply the change on tiny
scales only. When the ideal scale is not tiny, use the original policy
to clamp minimum scale to the native scale.
- Increasing kMinScaleRatioForWillChangeTransform from 0.1 to 0.25 to
reduce memory and number of tiles when the scale is bigger than ideal,
from 100x to 16x in worst cases.

Bug: 1146393
Change-Id: Ida5720f5126648c2fad0b9921781714fa006d346
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527733
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825998}

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wpt-commits: 4cf34e3fc5d4d673dee780015ebf194db71fd500
wpt-pr: 26475