Roll ANGLE from cdfc69c7f0f8 to 78ef4133f8de (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/cdfc69c7f0f8..78ef4133f8de

2020-05-19 shrekshao@google.com Fix invalid enums for OES_draw_buffers_indexed
2020-05-19 jdarpinian@chromium.org Enable regenerateStructNames workaround on iOS
2020-05-19 amaiorano@google.com Reland "Add support for GL_CHROMIUM_texture_filtering"

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-chromium-autoroll
Please CC geofflang@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win-asan;luci.chromium.try:win_optional_gpu_tests_rel;luci.chromium.try:linux-swangle-try-x64;luci.chromium.try:win-swangle-try-x86
Bug: chromium:1058744
Tbr: geofflang@google.com
Change-Id: I4d1ccac2a0be118a821217964fe5c2fc91852482
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209478Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#770358}

DEPS

@@ -190,7 +190,7 @@ 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': 'cdfc69c7f0f833e99b435715b3c012a2b61e55b1',
+  'angle_revision': '78ef4133f8de53a0303c92a49c12e6413c5de084',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.