AAPT2: Add descriptions of Attributes in Styleables for R.java

Change-Id: I69e7b73cbdfe4baf502348397435c501ae29ff5e
diff --git a/tools/aapt2/java/AnnotationProcessor.h b/tools/aapt2/java/AnnotationProcessor.h
index e7f2be0..fadf584 100644
--- a/tools/aapt2/java/AnnotationProcessor.h
+++ b/tools/aapt2/java/AnnotationProcessor.h
@@ -61,6 +61,8 @@
     void appendComment(const StringPiece16& comment);
     void appendComment(const StringPiece& comment);
 
+    void appendNewLine();
+
     /**
      * Writes the comments and annotations to the stream, with the given prefix before each line.
      */