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This is a reland of 786379ee

Original change's description:
> [proguard] Include proguard info in sourcefile attribute.
>
> Instead of setting the sourcefile to PG when obfuscating Java, set it
> to chromium-{mapping file}-{channel}-{version code} so that
>
> a) We can recognise chrome/webview stack frames by this string
> b) The information required to uniquely identify the proguard mapping
>    file in question is directly available in stack traces.
>
> Bug: 1044585
> Change-Id: Ib4fabccfb7693e5e97edc6f29be1cd6cb61fa1e6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036091
> Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
> Reviewed-by: Richard Coles <torne@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740625}

Bug: 1044585
Change-Id: Ib4f24fdd8a71e3048254000a525b82f5fbe3b4aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2054110Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741391}