Merge "ViewRootImpl: peek IME source instead of creating it" into sc-v2-dev am: 3f7eca5695 am: 712c609507

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16358839

Change-Id: I070d043279efb139bd79bca361aa0e4fbf827707