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I could cleanly apply this change to 78.

Bug: 987819
Test: manually tested on 4k display device
Change-Id: I9ed0c3a0f1007b46a213030fa19edf25dcb3810b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868840Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Mitsuru Oshima (slow) <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708015}