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This CL replaces the viewport state in PlayerFrameMediator with a new
PlayerFrameViewport class for managing state.

This causes a chain reaction requiring
1. A number of new method calls.
2. Removal of scale updates from moveViewport
3. Removal of scale maps for storing bitmaps

Bug: 1099722
Change-Id: Ia666485b59b0808af20055a1c023eb9e5176ecf5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285257Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786428}