Roll ANGLE a502c749:ab56c6ae

BUG=82385,angle:736

https://chromium.googlesource.com/angle/angle/+log/a502c749b249df6460326c4e5354f0549cc698d8..ab56c6aeff8ea52a8927a947ec20d19eb4564fc9

Review URL: https://codereview.chromium.org/538533002

Cr-Commit-Position: refs/heads/master@{#293247}
diff --git a/DEPS b/DEPS
index 1ee8cb84..b9cfba9 100644
--- a/DEPS
+++ b/DEPS
@@ -54,7 +54,7 @@
   # 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': 'a502c749b249df6460326c4e5354f0549cc698d8',
+  "angle_revision": "ab56c6aeff8ea52a8927a947ec20d19eb4564fc9",
   # 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.