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This CL fixes the fullscreen implementation living outside of web for
the NTP and other scrolling issues on web page.
It also fixes the animation of the resizing when the animator is
triggered.

Bug: 849206
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I8a13b88af6808472ef84ef6902c75c398451c961
Reviewed-on: https://chromium-review.googlesource.com/1195487Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592340}