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This is the first step of moving most of the signin java files to a
unique directory and gn component: //component/signin/public/android.
This moves only the //components/signin/*/identity_manager/android
classes. Will follow the relevant //components/signin/core ones.

Bug: 934688
Change-Id: I7b75a5b51b992b311ebf1133d7595a77f6ccd458
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814929
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726727}