Add DoNotStripAny

Summary:
This diff adds an annotation that also prevents stripping methods, fields and static blocks.

This is necessary for D23373168 to be OSS'd

Reviewed By: SidharthGuglani

Differential Revision: D23395925

fbshipit-source-id: 8456234cb75b15ae87580835e76f8e251ba09a9b

java/proguard-annotations/src/main/java/com/facebook/proguard/annotations/DoNotStripAny.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.proguard.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import static java.lang.annotation.RetentionPolicy.CLASS;
+
+/**
+ * Add this annotation to a class to instruct Proguard to not strip it or any of its fields or
+ * methods out.
+ *
+ * <p>This is useful for methods called via reflection that could appear as unused to Proguard.
+ */
+@Target({ElementType.TYPE})
+@Retention(CLASS)
+public @interface DoNotStripAny {}