Roll ANGLE from cc55138 to 08c4d09 (11 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/cc5513855cc5..08c4d09493bf

2020-07-18 kbr@chromium.org Improve WebGL 2.0 readPixels support.
2020-07-17 courtneygo@google.com Vulkan: Fix RTs attached to textures with non-0 mip
2020-07-17 ianelliott@google.com Vulkan: FramebufferVk::clearImpl() break-RP fix
2020-07-17 lehoangq@gmail.com Metal: Enable dEQP GLES2 tests on AMD.
2020-07-17 jmadill@chromium.org Perf Tests: Make "offscreen" a common test param.
2020-07-17 xinyi.he@arm.com Fix ContextLostTest if robustness ext is disabled
2020-07-17 syoussefi@chromium.org Enable fixed swiftshader tests
2020-07-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll VK-GL-CTS from 8726fda3f865 to 30aa06f22718 (5 revisions)
2020-07-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from 7221ccf85e26 to 680c77fa6c81 (2 revisions)
2020-07-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll glslang from 4f72970ed3e0 to f3cb1896971f (1 revision)
2020-07-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from 7548cbeabfa7 to 412b1b7dd18c (3 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 robertphillips@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: None
Tbr: robertphillips@google.com
Change-Id: I02416843ca1e6ef3966ac9e5b4c13dff72b71d91
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/303877
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>

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@cc5513855cc5bed41612c5cadd60f665e24ccce5",
+  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@08c4d09493bf22418d7eb75dd936ada79095e088",
   # 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@d0dd661f180503e1da910a6256b42ff8d72ab936",