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Following WebGPU spec change at https://github.com/gpuweb/gpuweb/issues/283,
this CL makes sure *loadOp and clear* are consolidated into an unioned
field in GPURenderPassColorAttachmentDescriptor and
GPURenderPassDepthStencilAttachmentDescriptor.

Bug: 877147
Change-Id: I4a676e8cfa52844f2df54b6201e6db453c1d9e9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715267Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#680373}