Roll ANGLE 9df01f8..c955058

https://chromium.googlesource.com/angle/angle.git/+log/9df01f8..c955058

BUG=

TBR=jmadill@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/2320863003
Cr-Commit-Position: refs/heads/master@{#417390}

DEPS

@@ -48,7 +48,7 @@ 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': '9df01f8ac568bc1fab58bf3d2ad8827a805342a3',
+  'angle_revision': 'c955058bdb9bb21e50a73e2f6c1b722e9f813d27',
   # 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.