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  * Port of Ash's MagnificationController to cast. First patchset is
    the original source, with changes/removals for cast in patchset 2.
  * Enabled via triple-tap when that is enabled.
  * Two-finger pan & pinch-to-zoom.

Bug: internal b/110532452
Test: manual
Change-Id: Ia346fcc6d4ff70aaa0236f1d976c3b0de13a0f86
Reviewed-on: https://chromium-review.googlesource.com/1170987Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582308}