Add missing folder for filtering tests. (#466)

Author: Vasil Hristov

assets/runtime/android/files/filtering/src/platforms/android/native-api-usage.json

@@ -0,0 +1,8 @@
+{
+    "uses": [
+      "java.util:List",
+      "java.util:ArrayList",
+      "java.util:Timer",
+      "android.appwidget.AppWidgetHost"
+    ]
+}

assets/runtime/android/files/filtering/src/platforms/ios/native-api-usage.json

@@ -0,0 +1,8 @@
+{
+    "uses": [
+               "CoreFoundation.CFArray:*",
+               "CoreFoundation.CFAttributedString:*",
+               "CoreFoundation.CFUUID:*",
+               "CoreFoundation.CFTimeZone:*"
+    ]
+}