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This is a reland of d205c616

Original change's description:
> Add native resource to dummy module and test loading in smoke test
>
> * Adds a new PAK file with a dummy resources.
> * Refactors the TestDummyModuleProvider to to synchronously load the
>   module PAK file when retrieving the impl.
> * Adds a friend to ScopedAllowBlocking in order to be able to memory
>   map the module PAK file on the main thread.
>
> Change-Id: I0a3b949b83b37a7089aa410a691de6ae28f9a36a
> Bug: 989646
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822847
> Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
> Reviewed-by: Theresa  <twellington@chromium.org>
> Reviewed-by: Christopher Grant <cjgrant@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Samuel Huang <huangs@chromium.org>
> Reviewed-by: Fred Mello <fredmello@chromium.org>
> Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702423}

TBR=twellington@chromium.org,cjgrant@chromium.org,dcheng@chromium.org,agrieve@chromium.org,huangs@chromium.org,fredmello@chromium.org

Bug: 989646
Change-Id: Ifab13d56aead63532ab57000e7253d0ce89f75b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837485Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702497}