Roll ANGLE bce743a..6253415

https://chromium.googlesource.com/angle/angle.git/+log/bce743a..6253415

BUG=586531,587846

TBR=jmadill@chromium.org

TEST=bots

CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel

Review URL: https://codereview.chromium.org/1719933002

Cr-Commit-Position: refs/heads/master@{#376743}

DEPS

@@ -51,7 +51,7 @@ 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': 'bce743aba493762704359d35af7e3134b539f71e',
+  'angle_revision': '6253415f35e07536ceace10cc9258e516b06dc7e',
   # 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.