Stack APPLICATION_MEDIA_OVERLAY windows with relative layering.

See accompanying frameworks/native commit
 "SurfaceFlinger: Add parent-less relative layering" for a full explanation.

Test: Manual of bug repro steps. Plus tests for new SurfaceControl functionality included in frameworks/native.
Bug: 36693738
Change-Id: Ic54598117c1f44a206d33f03d0cc463fbef43fcc
diff --git a/core/jni/android_view_SurfaceControl.cpp b/core/jni/android_view_SurfaceControl.cpp
index dc365b4..8b82314 100644
--- a/core/jni/android_view_SurfaceControl.cpp
+++ b/core/jni/android_view_SurfaceControl.cpp
@@ -289,6 +289,14 @@
     }
 }
 
+static void nativeSetRelativeLayer(JNIEnv* env, jclass clazz, jlong nativeObject,
+        jobject relativeTo, jint zorder) {
+    auto ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
+    sp<IBinder> handle = ibinderForJavaObject(env, relativeTo);
+
+    ctrl->setRelativeLayer(handle, zorder);
+}
+
 static void nativeSetPosition(JNIEnv* env, jclass clazz, jlong nativeObject, jfloat x, jfloat y) {
     SurfaceControl* const ctrl = reinterpret_cast<SurfaceControl *>(nativeObject);
     status_t err = ctrl->setPosition(x, y);
@@ -774,6 +782,8 @@
             (void*)nativeSetAnimationTransaction },
     {"nativeSetLayer", "(JI)V",
             (void*)nativeSetLayer },
+    {"nativeSetRelativeLayer", "(JLandroid/os/IBinder;I)V",
+            (void*)nativeSetRelativeLayer },
     {"nativeSetPosition", "(JFF)V",
             (void*)nativeSetPosition },
     {"nativeSetGeometryAppliesWithResize", "(J)V",