Merge "Add layer flag to allow creating an effect layer without color fill"...

Merge "Add layer flag to allow creating an effect layer without color fill" into rvc-dev am: 3c62656e am: d0e0d69c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/11662559

Change-Id: I3d4c4d289704be152e05047f68fd40576335935d