Change space key height in Emoji keyboard view

bug: 10538430

Change-Id: I724a8c92b49a64196c7da2af40f3d20758e0dbae
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 2a5334f..0978214 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -45,6 +45,8 @@
              possible states: normal, pressed, checkable, checkable+pressed, checkable+checked,
              checkable+checked+pressed. -->
         <attr name="keyBackground" format="reference" />
+        <!-- Image for the functional key used in Emoji layout. -->
+        <attr name="keyBackgroundEmojiFunctional" format="reference" />
 
         <!-- Horizontal padding of left/right aligned key label to the edge of the key. -->
         <attr name="keyLabelHorizontalPadding" format="dimension" />