MiraclePtr: Fetch partition_alloc.

Fetch partition_alloc, and make dawn to depend on it in Skia Standalone
configuration.

For now, partition_alloc is not configured to handle the allocations in
Skia tests. So this is mostly a no-op. It only shows partition_alloc
can be built from Skia.

Doc:
https://docs.google.com/document/d/1fhs7l6LTtwz-dJIwGLqzgVczXS-QmpUakq-RG4BCpfc/edit

Bug:351867706
Change-Id: I0d6d92144af680fa8954df851c59bbb40ba771d7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/862356
Reviewed-by: Kaylee Lubick <kjlubick@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Auto-Submit: Arthur Sonzogni <arthursonzogni@chromium.org>
4 files changed