[iOS][MF] Add support for device rotation

Adds a flag wich resets after a delay when the device rotates. This
allows to know if certain notification are caused due a recent rotation.

Bug: 845472
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I7b36544a451c677ff0ff842876f80841847a2833
Reviewed-on: https://chromium-review.googlesource.com/c/1273145
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601072}
2 files changed