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Text input state and IME visibility are indended for PlatformWindow.
WindowTree calls WindowServiceDelegate to update them.
WindowServiceDelegateImpl forwards the states to
AshWindowTreeHostPlatfom to update the underlying PlatformWindow
if the change comes from an active window.

Bug: 852440
Change-Id: Id584ba0f5a17768fddd3d54caa2e9da051b14ee7
Reviewed-on: https://chromium-review.googlesource.com/1112069
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569788}