Fixed in https://chromium-review.googlesource.com/c/521904/.

Not sure why Gerrit didn't post the CL automatically in this bug.. Some known problem with Gerrit?

Sometimes there's a delay in the process.

This bug requires manual review: M60 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Please apply appropriate OSs.  Thanks.

We're late into M60 and cracking down on merges for this milestone, I'd prefer to wait until M61.  If you feel strongly this should get merged, feel free to add back the Merge-Request-60 label and we'll re-review.

 Issue 718651  has been merged into this issue.

 Bug 718651  (shaka) hit this. joeyparrish@ / xhwang@ : Does shaka hitting this bug increase the merits of merging this to M-60?

Added back Merge-Request-60 for re-review.

This bug requires manual review: M60 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), josafat@(ChromeOS), bustamante@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Approving for merge into M60 (build 3112) based on comments in 718651 and that it meets the other criteria.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eeeb4a90b625101576e87b57360e61ce6ac73685

commit eeeb4a90b625101576e87b57360e61ce6ac73685
Author: KongQun Yang <kqyang@chromium.org>
Date: Thu Jun 22 00:05:28 2017

Allow encrypted partition size to be zero

This could happen if a media sample has less than 16 bytes of
compressed data, which can be left in clear if the packager
wants to block align encrypted data. In this case, the content
packager can mark the sample as not encrypted or mark the sample
as encrypted but with num_partitions = 0, which contains only
clear data effectively.

TBR=kqyang@chromium.org

(cherry picked from commit 7b5d7cc2759780ff45bba356566ba9c76e70c957)

Bug:  728773 
Change-Id: If0a3d2622307d1cb83b88e8637a28d463a3116d4
Reviewed-on: https://chromium-review.googlesource.com/521904
Commit-Queue: Kongqun Yang <kqyang@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#476812}
Reviewed-on: https://chromium-review.googlesource.com/543922
Reviewed-by: Kongqun Yang <kqyang@chromium.org>
Cr-Commit-Position: refs/branch-heads/3112@{#436}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
[modify] https://crrev.com/eeeb4a90b625101576e87b57360e61ce6ac73685/media/formats/webm/webm_cluster_parser.cc
[modify] https://crrev.com/eeeb4a90b625101576e87b57360e61ce6ac73685/media/formats/webm/webm_cluster_parser_unittest.cc
[modify] https://crrev.com/eeeb4a90b625101576e87b57360e61ce6ac73685/media/formats/webm/webm_crypto_helpers.cc
[modify] https://crrev.com/eeeb4a90b625101576e87b57360e61ce6ac73685/media/formats/webm/webm_crypto_helpers_unittest.cc