Roll ANGLE from de309a4 to c20449a (12 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/de309a42385f..c20449a879c6

2020-07-28 jmadill@chromium.org DEPS: Remove use_relative_hooks.
2020-07-28 cnorthrop@google.com Capture/Replay: Break up SetupContext
2020-07-28 jonahr@google.com Add mac_xcode_version gclient arg to DEPS
2020-07-28 jmadill@chromium.org Perf Tests: Use timestamp queries for GPU time.
2020-07-28 tobine@google.com Vulkan: Add new validation skips
2020-07-28 nguyenmh@google.com Remove context id serialization
2020-07-28 jmadill@chromium.org D3D11: Fix bug with static vertex attributes.
2020-07-28 nguyenmh@google.com Adds sampler serialization capability
2020-07-28 syoussefi@chromium.org Vulkan: Fix sub invalidate marking render targets undefined
2020-07-28 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from 361fb5311b9b to 171e04fac342 (8 revisions)
2020-07-28 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from 8b5ed4448dfe to 150be20d4334 (33 revisions)
2020-07-28 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from 3b2cd31c7400 to 12c9d4ac61f2 (4 revisions)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-skia-autoroll
Please CC borenet@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: skia/skia.primary:Build-Debian10-Clang-x86_64-Release-ANGLE;skia/skia.primary:Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUC8i5BEK-GPU-IntelIris655-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE
Bug: chromium:1107325,chromium:1107433
Tbr: borenet@google.com
Test: Test: NBA2K20 MEC
Change-Id: I094230ff6499be68990551fb02ce49d55c97e662
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/306311
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>

Author: skia-autoroll

DEPS

@@ -7,7 +7,7 @@ vars = {
 deps = {
   "buildtools"                            : "https://chromium.googlesource.com/chromium/buildtools.git@505de88083136eefd056e5ee4ca0f01fe9b33de8",
   "common"                                : "https://skia.googlesource.com/common.git@9737551d7a52c3db3262db5856e6bcd62c462b92",
-  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@de309a42385ff25c13360f40c74c5340b5df3f57",
+  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@c20449a879c607590cf519b1c437eadf492f6bec",
   # Dawn requires jinja2 and markupsafe for the code generator, and glslang and shaderc for SPIRV compilation.
   # When the Dawn revision is updated these should be updated from the Dawn DEPS as well.
   "third_party/externals/dawn"            : "https://dawn.googlesource.com/dawn.git@c11a19145f1f5a8846d0123e22c261966949466c",