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Also adds unit tests for the UrlFormatter java wrapper which didn't
previously exist.

Bug: 783819
Change-Id: Ib98bd5daa64a48bb06d6593185f53f49ad22b3c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036730
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738268}