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This change creates the basic WebAppMover class, but the functionality
is currently a NOOP. However it is hooked in correctly, and the
implementation would start where marked.

Unittests are included to test the initial sanity checking of the
source and destination URLs.

Follow up patches will include the implementation and thorough
browsertests.

Bug: 1158066
Change-Id: I04b0a3971932f30c4bbb3b8605f84dc0ea64be99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587825
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838147}