Merge "Enable dither for DismissView" into udc-dev am: dcced529e6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23050899

Change-Id: I0d8cd5e4bcf5a8eccba81cede2b6e0a93320b027
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

libs/WindowManager/Shell/src/com/android/wm/shell/bubbles/DismissView.kt

@@ -144,6 +144,7 @@ class DismissView(context: Context) : FrameLayout(context) {
         val gd = GradientDrawable(
                 GradientDrawable.Orientation.BOTTOM_TOP,
                 intArrayOf(gradientColorWithAlpha, Color.TRANSPARENT))
+        gd.setDither(true)
         gd.setAlpha(0)
         return gd
     }