https://codereview.chromium.org/2542563006/ has landed to fix the problem

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e7fb021034c6274c8157d57de81ec419fa221c49

commit e7fb021034c6274c8157d57de81ec419fa221c49
Author: Min Qin <qinmin@chromium.org>
Date: Fri Dec 02 18:41:35 2016

Don't animate the notification for pending download

using stat_sys_download_done, which is the first frame of the animation

TBR=dfalcantara@chromium.org
BUG= 670428 

Review-Url: https://codereview.chromium.org/2542563006
Cr-Commit-Position: refs/heads/master@{#435870}
(cherry picked from commit 601e4f48a3db0aa334f325c03071f5b1d7c4093b)

Review URL: https://codereview.chromium.org/2545003003 .

Cr-Commit-Position: refs/branch-heads/2924@{#290}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}

[modify] https://crrev.com/e7fb021034c6274c8157d57de81ec419fa221c49/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadNotificationService.java

Your change meets the bar and is auto-approved for M56 (branch: 2924)

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

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Lets merge it into M56

It looks like the merge came before the label was updated to Merge-Approved-56, therefore there is nothing really more to do here, but removing Merge-Approved label.