Merge "Style the Magnification Window - Window Mode Drag" into udc-dev am: 529d82eb am: 87567f86

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



Change-Id: Ibcc7420c6f03e275ed5f7dddebcec0f5383cd175
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>