Support colorScheme <case/> condition in Keyboard XML

Change-Id: Ibbfb99e0e2b15df301f83af6739b7bca01ebf490
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 5f29af2..24c9855 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -57,14 +57,15 @@
         <attr name="backgroundDimAmount" format="float" />
 
         <attr name="keyTextStyle">
-            <flag name="normal" value="0" />
-            <flag name="bold" value="1" />
-            <flag name="italic" value="2" />
+            <enum name="normal" value="0" />
+            <enum name="bold" value="1" />
+            <enum name="italic" value="2" />
         </attr>
 
-        <attr name="symbolColorScheme">
-            <flag name="white" value="0" />
-            <flag name="black" value="1" />
+        <attr name="colorScheme">
+            <!-- This should be aligned with BaseKeyboardView.COLOR_SCHEME_* -->
+            <enum name="white" value="0" />
+            <enum name="black" value="1" />
         </attr>
 
     </declare-styleable>