Roll ANGLE a0bcc50..13c0dd4

https://chromium.googlesource.com/angle/angle.git/+log/a0bcc50..13c0dd4

BUG=

TEST=bots

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Change-Id: I2cccfe2d8a3fd84eecb9bbb6ecec1b382dcddbda
Reviewed-on: https://chromium-review.googlesource.com/600854Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491868}

DEPS

@@ -52,7 +52,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': 'a0bcc50be0c726c14e9623b174e1bcbe61720428',
+  'angle_revision': '13c0dd4631b13c76c9d8bc8d01c5236567a57b14',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.