Add ZWNJ and ZWJ icons

Bug: 5456620
Change-Id: I7238f41c841803746ca2ab6cd332b2be8498a3ee
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index e33f0ba..550f5ac 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -224,6 +224,8 @@
         <attr name="iconDisabledShortcutKey" format="reference" />
         <attr name="iconPreviewTabKey" format="reference" />
         <attr name="iconLanguageSwitchKey" format="reference" />
+        <attr name="iconZwnjKey" format="reference" />
+        <attr name="iconZwjKey" format="reference" />
     </declare-styleable>
 
     <declare-styleable name="Keyboard_Key">
@@ -309,6 +311,8 @@
             <enum name="iconSpaceKeyForNumberLayout" value="10" />
             <enum name="iconShiftKeyShifted" value="11" />
             <enum name="iconLanguageSwitchKey" value="14" />
+            <enum name="iconZwnjKey" value="15" />
+            <enum name="iconZwjKey" value="16" />
         </attr>
         <!-- The icon for disabled key -->
         <attr name="keyIconDisabled" format="enum">