Include <init>() member rules in desugared library gson test

Change-Id: I22f3b8dbe76f7574b1a0e2b4fedfa4550ba7133b
diff --git a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/gson/gson.cfg b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/gson/gson.cfg
index 2b36e8a..610e4a6 100644
--- a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/gson/gson.cfg
+++ b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/gson/gson.cfg
@@ -14,12 +14,26 @@
 -dontwarn sun.misc.Unsafe
 
 # Application classes that will be serialized/deserialized over Gson
--keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$Data { <fields>; }
--keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableConcurrentHashMap
--keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableHashMap
--keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableMap
--keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableConcurrentMap
--keep class com.android.tools.r8.desugar.desugaredlibrary.gson.OptionalTestClass$Data { <fields>; }
+-keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$Data {
+  void <init>();
+  <fields>;
+}
+-keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableConcurrentHashMap {
+  void <init>();
+}
+-keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableHashMap {
+  void <init>();
+}
+-keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableMap {
+  void <init>();
+}
+-keep class com.android.tools.r8.desugar.desugaredlibrary.gson.AllMapsTestClass$NullableConcurrentMap {
+  void <init>();
+}
+-keep class com.android.tools.r8.desugar.desugaredlibrary.gson.OptionalTestClass$Data {
+  void <init>();
+  <fields>;
+}
 
 # Prevent R8 from stripping interface information from TypeAdapter, TypeAdapterFactory,
 # JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)