Roll Dawn from f2bc3b3edd6f to a0758a1aef12 (5 revisions)

https://dawn.googlesource.com/dawn.git/+log/f2bc3b3edd6f..a0758a1aef12

2020-11-18 [email protected] D3D12: Only enable toggle 'use_dxc' when Dawn can load DXC DLLs
2020-11-17 [email protected] Use hermetic XCode on Dawn standalone builders.
2020-11-17 [email protected] Stop setting mac_xcode_version in DEPS
2020-11-17 [email protected] Roll Tint from 4ad0019df0f0 to 90f32536458a (17 revisions)
2020-11-17 [email protected] Use smart Refs for IOKit and CoreFoundation objects.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dawn-skia-autoroll
Please CC [email protected] 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-Debug-Dawn
Bug: None
Tbr: [email protected]
Change-Id: I9a752c55d3314a6138cc2abdb17719a8bbb98b01
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335674
Reviewed-by: skia-autoroll <[email protected]>
Commit-Queue: skia-autoroll <[email protected]>

Author: skia-autoroll

DEPS

@@ -12,7 +12,7 @@ deps = {
   "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.
   # 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@f2bc3b3edd6f3a8424b230b17f844f59768d53b8",
+  "third_party/externals/dawn"            : "https://dawn.googlesource.com/dawn.git@a0758a1aef12b02216c2df2781d8e1458d6d7da6",
   "third_party/externals/glslang"         : "https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang@4dcc12d1a441b29d5901bc708bb1343d29d6459f",
   "third_party/externals/jinja2"          : "https://chromium.googlesource.com/chromium/src/third_party/jinja2@a82a4944a7f2496639f34a89c9923be5908b80aa",
   "third_party/externals/markupsafe"      : "https://chromium.googlesource.com/chromium/src/third_party/markupsafe@0944e71f4b2cb9a871bcbe353f95e889b64a611a",