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Previously, "transform: translateZ(0)" was used as a compositing trigger
in web tests. This patch updates these cases to use "will-change:
transform" which is more explicit.

Bug: 1012775
Change-Id: I35cccc654da8df868ce54e0d4e4ad9e1551b1552
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854168
Commit-Queue: Philip Rogers <pdr@chromium.org>
Auto-Submit: Philip Rogers <pdr@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705561}