Merge "Style the Magnification Window - Window Mode Drag" into udc-dev am: 529d82eb am: f62caa90

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21779985



Change-Id: I8f9fbdda27e84251277c84ce6caebd010a6726cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>