Bug 1155331 - Add ReflectionTarget annotation. r=nalexander

This is a clone of @JNITarget and @RobocopTarget.

--HG--
extra : commitid : AhiQ1OmtCY0
extra : rebase_source : 6fb3880e2368a163292b968084991ca965a12211
extra : source : 62dbceeb9f18238ed2725564db03a2a2c6491f94

mobile/android/base/annotation/ReflectionTarget.java

@@ -0,0 +1,18 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/*
+ * Used to indicate to ProGuard that this definition is accessed
+ * via reflection and should not be stripped from the source.
+ */
+@Target({ElementType.TYPE, ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.FIELD})
+@Retention(RetentionPolicy.CLASS)
+public @interface ReflectionTarget {}

mobile/android/base/moz.build

@@ -15,6 +15,7 @@ constants_jar = add_java_jar('constants')
 constants_jar.sources = [
     'adjust/AdjustHelperInterface.java',
     'annotation/JNITarget.java',
+    'annotation/ReflectionTarget.java',
     'annotation/RobocopTarget.java',
     'annotation/WebRTCJNITarget.java',
     'annotation/WrapForJNI.java',

mobile/android/config/proguard/proguard.cfg

@@ -162,6 +162,22 @@
     @org.mozilla.gecko.annotation.RobocopTarget <fields>;
 }
 
+# keep Reflection targets
+-keep @interface org.mozilla.gecko.annotation.ReflectionTarget
+-keep @org.mozilla.gecko.annotation.ReflectionTarget class *
+-keepclassmembers class * {
+    @org.mozilla.gecko.annotation.ReflectionTarget *;
+}
+-keepclassmembers @org.mozilla.gecko.annotation.ReflectionTarget class * {
+    *;
+}
+-keepclasseswithmembers class * {
+    @org.mozilla.gecko.annotation.ReflectionTarget <methods>;
+}
+-keepclasseswithmembers class * {
+    @org.mozilla.gecko.annotation.ReflectionTarget <fields>;
+}
+
 # Keep WebRTC targets.
 -keep @interface org.mozilla.gecko.annotation.WebRTCJNITarget
 -keep @org.mozilla.gecko.annotation.WebRTCJNITarget class *