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This CL applies a gradient mask to fade the label so that the
pin icon appears to cover the label instead of resizing the label.

Bug: 1137959
Change-Id: I6bbfed603bc7f41b8a266e72a00ed55a74849556
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543370
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#829041}