GitLab

Background: Implementation of the side swipe system gesture handling
is present only in the CastWindowManagerAura implementation, but
actual users will only have a handle to the base CastWindowManager
interface. This CL pulls the methods up to the interface and leaves
them as stubs in the CastWindowManagerDefault.

Bug: b/71541742
Tested: Manual testing
Change-Id: Ib83e42b046153a0e680f8d76eda6d9c0e7bb655d
Reviewed-on: https://chromium-review.googlesource.com/891478Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532575}