Add isIconDefined predicate to Keyboard_Case attribute

Bug: 14259323
Change-Id: I9450a5125b1809b9fada6ee6e6b253cabfa2e2b4
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 475e92f..4c7ed69 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -431,6 +431,7 @@
             <!--  This should be aligned with KeyboardId.IME_ACTION_* -->
             <enum name="actionCustomLabel" value="0x100" />
         </attr>
+        <attr name="isIconDefined" format="string" />
         <attr name="localeCode" format="string" />
         <attr name="languageCode" format="string" />
         <attr name="countryCode" format="string" />