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Rather than allowing arbitrary scales, only allow integer scales and 1.5
(for 1080p). This means we won't apply strange scales that may not work
well when using a non-standard resolution. There's no change for standard
TV resolutions.

Bug: b/117782357
Test: cast_graphics_unittests

Change-Id: Ied44492232fbe7bf61d0d48e99ab5a6038f28031

Reviewed-on: https://chromium-review.googlesource.com/c/1344904
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609853}