Roll ANGLE from ebc6d0a4b9ec to f2d4abb2ef18 (4 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/ebc6d0a4b9ec..f2d4abb2ef18

2020-06-03 geofflang@chromium.org Vulkan: Correct the viewport before intersecting it with the scissor.
2020-06-03 syoussefi@chromium.org Vulkan: Remove validation error suppressions for VVL bug
2020-06-03 syoussefi@chromium.org Vulkan: Remove validation error suppression for fixed issue
2020-06-03 ianelliott@google.com Vulkan: Pre-rotate dFdx() & dFdy() for Android

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 ynovikov@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:1078378
Tbr: ynovikov@google.com
Test: Test: angle_deqp_gles3_tests --gtest_filter=dEQP.GLES3/functional_shaders_derivateTest: Test: angle_end2end_tests --gtest_filter=*EGLPreRotationSurfaceTest.OrientedWindow
Change-Id: I122be5c8a02ce3497157ad77c911ef4bb3a3cfe6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2229266Reviewed-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@{#774890}

DEPS

@@ -194,7 +194,7 @@ 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': 'ebc6d0a4b9ecfb11275afa22f687378ab6a79e02',
+  'angle_revision': 'f2d4abb2ef182108f3b87da301dbcb0fa949f8b1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.