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Dawn is a library implementing WebGPU in native. It uses SPIRV-Cross to
translate shaders from SPIRV to other shading languages, and requires
glfw for testing.

Adds the Zlib license to the list of allowed license for Android.

This also adds back shaderc that was very recently removed. So hopefully
a new third_party review isn't required.

BUG=chromium:870747

Change-Id: I506156072f34e70e12797f922a979aa8c743bd6e
Reviewed-on: https://chromium-review.googlesource.com/c/1244817Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599740}