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There may be a one-pixel gap between the gradient zone and the arrow
button (not always). It is caused by the rounding error during painting.
The easiest way to fix this is to enlarge the gradient zone by one
pixel. It does not introduce other visual side effects.

Bug: 1018965
Change-Id: Ifceb1310adee0e907ec3fc1ed7e88ea50af2b7fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885092
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710377}