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Created a skeleton for the Long Screenshots service. This will eventually
be used to call Freeze-Dried Tabs and generate the bitmaps needed for the
screenshot.

Bug: 1142520
Change-Id: Ia9e9ff5cc79d316ea6048e127c83f70a55c54996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518090Reviewed-by: Kyle Milka <kmilka@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Tanya Gupta <tgupta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825429}