Roll ANGLE from 8da60e2523c7 to 83c7e1ae8626 (4 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/8da60e2523c7..83c7e1ae8626

2020-09-17 amy.liu@arm.com Fix the regression of color blit.
2020-09-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from e8ce4355ae1c to 34ef0c3fdc8e (5 revisions)
2020-09-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from f105898a102f to 46fc663a1cb3 (4 revisions)
2020-09-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from b33e0b36a08c to fe878dedd5ad (1 revision)

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 jmadill@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: None
Tbr: jmadill@google.com
Test: Test: dEQP-GLES3.functional.fbo.blit.default_framebuffer.*_linear_*
Change-Id: I1ae57bc4d33e23bcfdf671745b1865424ce0511a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416789Reviewed-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@{#807948}

DEPS

@@ -207,7 +207,7 @@ 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': '8da60e2523c7a8f3066cbf058182ae4d42d29635',
+  'angle_revision': '83c7e1ae8626b8e2c1e3a2d2637abe277ba4999c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.