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Currently, we have duplicate implementations of viz::ResourceFormat
to WGPUTextureFormat conversion. This CL exposes a new ToWGPUFormat
function in resource_format_utils and removes duplicate code.

Note: ToWGPUFormat calls ToDawnFormat under the hood and casts from
dawn::TextureFormat to WGPUTextureFormat. Looking at the
definitions [1][2], it seems like they are generated from the same
place, so this cast is safe?

[1] https://cs.chromium.org/chromium/src/out/Debug/gen/third_party/dawn/src/include/dawn/webgpu.h?type=cs&q=WGPUTextureFormat&sq=package:chromium&g=0&l=252
[2] https://cs.chromium.org/chromium/src/out/Debug/gen/third_party/dawn/src/include/dawn/webgpu_cpp.h?type=cs&q=BGRA8Unorm+f:dawn&sq=package:chromium&g=0&l=176

Change-Id: I6159240c40c084a6d9fd3c8f7b4ff66ab03063f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950750Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Brian Ho <hob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722620}