Roll ANGLE 4d0bf55..38ef7c8

https://chromium.googlesource.com/angle/angle.git/+log/4d0bf55..38ef7c8

BUG=chromium:677837

TBR=scottmg@chromium.org

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

Review-Url: https://codereview.chromium.org/2603283002
Cr-Commit-Position: refs/heads/master@{#441080}

DEPS

diff --git a/DEPS b/DEPS
index c08a090..f06472c 100644
--- a/DEPS
+++ b/DEPS
@@ -52,7 +52,7 @@
   # 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': '4d0bf5579c52ecd6a93f2c9bf145e628106b4ffa',
+  'angle_revision': '38ef7c8c97d1e28cb52816eedb823438c3057cee',
   # 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.