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NativeWidgetAndroidis very similar to NativeWidgetAura. It
owns a WindowTreeHost and FocusController which initialized
from AndroidFocusRules. Aura on Android should use this
native widget for top level windows. It should create and host
the Widget in a native Android window.

BUG=507792

Review URL: https://codereview.chromium.org/1403293003

Cr-Commit-Position: refs/heads/master@{#360645}