Making ViewRootImpl drop input events when the Activity is in ambient mode.
Making ViewRootImpl drop input events when the Activity is in ambient
mode.

WearableActivityController tells ViewRootImpl about ambient mode.

Bug: 25912259
Bug: 25973146
Bug: 25714113
Change-Id: Idcca2b254db3145039f50f2a7dfd38a224ec287e

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base