Add maxTargetSdk restriction to unused APIs.

These are APIs that have @UnsupportedAppUsage but for which we don't
have any evidence of them currently being used, so should be safe to
remove from the unsupported list.

Bug: 170729553
Test: Treehugger
Change-Id: I4c8fd0006f950de9955242e93968fb0996ceb372

graphics/java/android/graphics/BitmapFactory.java

@@ -23,6 +23,7 @@ import android.annotation.Nullable;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.content.res.AssetManager;
 import android.content.res.Resources;
+import android.os.Build;
 import android.os.Trace;
 import android.util.DisplayMetrics;
 import android.util.Log;
@@ -875,7 +876,7 @@ public class BitmapFactory {
     @UnsupportedAppUsage
     private static native Bitmap nativeDecodeFileDescriptor(FileDescriptor fd,
             Rect padding, Options opts, long inBitmapHandle, long colorSpaceHandle);
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private static native Bitmap nativeDecodeAsset(long nativeAsset, Rect padding, Options opts,
             long inBitmapHandle, long colorSpaceHandle);
     @UnsupportedAppUsage