Initial split QWERTY layout

Change [2/3]

Add an attribute that's used in layout xmls for specifying
the split-keyboard layout.
This attribute will be checked/set by the KeyboardBuilder which knows about
the "splittability" of the keyboard.

Bug: 4968173
Change-Id: I5d792e570b9648e09022e9b7e92a972a161009ee
diff --git a/java/res/xml-sw600dp/row_qwerty4.xml b/java/res/xml-sw600dp/row_qwerty4.xml
index ed7150d..bcfd2cb 100644
--- a/java/res/xml-sw600dp/row_qwerty4.xml
+++ b/java/res/xml-sw600dp/row_qwerty4.xml
@@ -21,23 +21,54 @@
 <merge
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
-    <Row
-        latin:keyWidth="9.0%p"
-        latin:backgroundType="functional"
-    >
-        <Key
-            latin:keyStyle="toSymbolKeyStyle"
-            latin:keyWidth="10.0%p" />
-        <include
-            latin:keyboardLayout="@xml/key_comma" />
-        <!-- Space key. -->
-        <include
-            latin:keyXPos="19.0%p"
-            latin:keyboardLayout="@xml/key_space_7kw"
-            latin:backgroundType="normal" />
-        <include
-            latin:keyboardLayout="@xml/key_period" />
-        <include
-            latin:keyboardLayout="@xml/key_emoji" />
-    </Row>
+    <switch>
+        <!-- Split the 4th row for split layouts -->
+        <case
+            latin:isSplitLayout="true"
+        >
+            <Row
+                latin:keyWidth="8.0%p"
+                latin:backgroundType="functional"
+            >
+                <Key
+                    latin:keyStyle="toSymbolKeyStyle" />
+                <include
+                    latin:keyboardLayout="@xml/key_comma" />
+                <!-- Space key. -->
+                <include
+                    latin:keyboardLayout="@xml/key_space_3kw"
+                    latin:backgroundType="normal" />
+                <Spacer
+                    latin:keyWidth="20.0%p" />
+                <Key
+                    latin:keyStyle="spaceKeyStyle"
+                    latin:keyWidth="24.0%p" />
+                <include
+                    latin:keyboardLayout="@xml/key_period" />
+                <include
+                    latin:keyboardLayout="@xml/key_emoji" />
+            </Row>
+        </case>
+        <default>
+            <Row
+                latin:keyWidth="9.0%p"
+                latin:backgroundType="functional"
+            >
+                <Key
+                    latin:keyStyle="toSymbolKeyStyle"
+                    latin:keyWidth="10.0%p" />
+                <include
+                    latin:keyboardLayout="@xml/key_comma" />
+                <!-- Space key. -->
+                <include
+                    latin:keyXPos="19.0%p"
+                    latin:keyboardLayout="@xml/key_space_7kw"
+                    latin:backgroundType="normal" />
+                <include
+                    latin:keyboardLayout="@xml/key_period" />
+                <include
+                    latin:keyboardLayout="@xml/key_emoji" />
+            </Row>
+        </default>
+    </switch>
 </merge>