The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f74fd8cda50bb8bcc0c2d5c1fc695f86c7aa581a

commit f74fd8cda50bb8bcc0c2d5c1fc695f86c7aa581a
Author: tkent <tkent@chromium.org>
Date: Wed Mar 16 16:26:55 2016

Add unicode flag to blink::ScriptRegexp, and measure incompatibility for |pattern| content attribute.

"u" flag might cause compatibility issues.
e.g.
  pattern="\a" is same as "a" in BMP mode.
  pattern="\a" is an error in Unicode mode.
  pattern=".." matches to value="

Your change meets the bar and is auto-approved for M50 (branch: 2661)

Please try to merge your change to M50 branch 2661 asap as we're getting closer to M50 beta candidate cut for this week. Thank you.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/83541513f79a28c0ee4130a4d1cd4c20e0f8f386

commit 83541513f79a28c0ee4130a4d1cd4c20e0f8f386
Author: Kent Tamura <tkent@chromium.org>
Date: Mon Mar 21 23:39:22 2016

Merge "Add unicode flag to blink::ScriptRegexp, and measure incompatibility for |pattern| content attribute." to M50

"u" flag might cause compatibility issues.
e.g.
  pattern="\a" is same as "a" in BMP mode.
  pattern="\a" is an error in Unicode mode.
  pattern=".." matches to value="