This patch adds the entry point of CreateReadyComputePipeline in both
dawn_native and dawn_wire.
TODOs:
1. Add more tests in dawn_unittests and dawn_end2end_tests.
2. Put the main logic of creating a pipeline into a separate thread.
BUG=dawn:529
TEST=dawn_end2end_tests
Change-Id: I7edd269a5422a8b85320a7f9173df925decba633
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/30060
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>