Roll dawn from 37f547456cc6 to 4a486be696b4 (3 revisions)

https://dawn.googlesource.com/dawn.git/+log/37f547456cc6..4a486be696b4

2020-08-12 enga@chromium.org Roll third_party/tint/ bc80805c4..5e7ef27ca (9 commits)
2020-08-12 cwallez@chromium.org Update tests to use new mapping APIs
2020-08-12 cwallez@chromium.org Small nits for the implementation of WriteTexture in D3D12

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 cwallez@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-Debug-Dawn
Bug: None
Tbr: cwallez@google.com
Change-Id: I18ec2bf6a913c91550c78af6ece54658f852faf9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/309866
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

@@ -10,7 +10,7 @@ deps = {
   "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@d667ad2f0127117e6a30057b09810dc0cce261e9",
   # 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@37f547456cc61ba30bb27a60a18cbbdf1cd0d7e5",
+  "third_party/externals/dawn"            : "https://dawn.googlesource.com/dawn.git@4a486be696b44151bbda5e837a784560b2d9154f",
   "third_party/externals/glslang"         : "https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang@b60e067b43744ce88adea33ab347ac9997b923d8",
   "third_party/externals/jinja2"          : "https://chromium.googlesource.com/chromium/src/third_party/jinja2@b41863e42637544c2941b574c7877d3e1f663e25",
   "third_party/externals/markupsafe"      : "https://chromium.googlesource.com/chromium/src/third_party/markupsafe@8f45f5cfa0009d2a70589bcda0349b8cb2b72783",