Roll ANGLE from 4f96bf19941b to 2ffff6d024c7 (21 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/4f96bf19941b..2ffff6d024c7

2020-11-17 syoussefi@chromium.org Vulkan: Support image buffers
2020-11-17 cclao@google.com Vulkan: Experimental: forcing highp to mediump in fragment shader.
2020-11-17 syoussefi@chromium.org Default deqp to Vulkan on !Apple
2020-11-17 kainino@chromium.org Add TODOs for Apple DTK skips; update bug urls
2020-11-17 m.maiya@samsung.com Vulkan: Add EXT_external_buffer support
2020-11-17 kainino@chromium.org Disable more tests for Apple DTK (macOS ARM)
2020-11-17 m.maiya@samsung.com Vulkan: Add GL_EXT_separate_shader_objects support
2020-11-17 m.maiya@samsung.com Vulkan: Add EXT_separate_shader_objects entry points
2020-11-17 thakis@chromium.org Stop setting mac_xcode_version in DEPS
2020-11-17 syoussefi@chromium.org Vulkan: 270 degree prerotation deqp expectations
2020-11-17 syoussefi@chromium.org GL: Support OES_shader_image_atomic
2020-11-17 syoussefi@chromium.org Vulkan: Support texture buffers
2020-11-17 syoussefi@chromium.org Use 0 as special value for glTexBuffer instead of UINT_MAX
2020-11-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll VK-GL-CTS from 9e07e4424cd4 to 4fe17f3425ee (12 revisions)
2020-11-17 syoussefi@chromium.org Vulkan: Reuse GetBoundBufferAvailableSize in ProgramExecutableVk
2020-11-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from 9d3ef3258715 to 0cb8cc8cfcb2 (4 revisions)
2020-11-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from e4c1a25cc679 to 04515da400d5 (3 revisions)
2020-11-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from 089f5a3ecbe4 to d8a3265375ff (384 revisions)
2020-11-17 syoussefi@chromium.org Vulkan: Make ImageViewHelper a Resource
2020-11-17 amy.liu@arm.com Fix flip info of colorBlit with pre-rotation.
2020-11-17 cclao@google.com Vulkan: Remove rotation related data from driver uniform

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 lovisolo@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
Tbr: lovisolo@google.com
Test: Test: ExternalBufferTestES31.*VulkanTest: Test: ProgramPipelineTest.GenerateProgramPipelineObjectEXT*
Change-Id: I2f539914f631b8655516fce6f4f73c9e16c7758f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335673
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 3d657fa..82f5316 100644
--- a/DEPS
+++ b/DEPS
@@ -7,7 +7,7 @@
 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@4f96bf19941b3842126eb047d0573a053648bbdc",
+  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@2ffff6d024c7d639ecf4258402c2d047bb09588a",
   "third_party/externals/brotli"          : "https://skia.googlesource.com/external/github.com/google/brotli.git@e61745a6b7add50d380cfd7d3883dd6c62fc2c71",
   "third_party/externals/d3d12allocator"  : "https://skia.googlesource.com/external/github.com/GPUOpen-LibrariesAndSDKs/D3D12MemoryAllocator.git@169895d529dfce00390a20e69c2f516066fe7a3b",
   # Dawn requires jinja2 and markupsafe for the code generator, and glslang and shaderc for SPIRV compilation.