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The CL was reverted by an unrelated crash. Now reland it. The link
to the original CL: crrev.com/c/1815723

Original description:
Now scrollable shelf ensures that when two arrow buttons show, the
right gradient zone always cuts the half of the rightmost icon. To
implement this feature, some available space is wasted. As a result,
there may be no sufficient space for scrollable shelf on
small-screen devices. In this CL, the width of the gradient zone
becomes a constant.

Bug: 1005989
Change-Id: I29fcb766562860d9d4ca5d21a497b193300ddd47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832914Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701663}