Add dimen of keyline 1 and keyline 3 diff value.

Test: manual
Change-Id: I3f25a45a408095c042b7aac4f8d6fa1a80c6252a
diff --git a/car/res/values-w930dp/dimens.xml b/car/res/values-w930dp/dimens.xml
index 6d7714e..0e68594 100644
--- a/car/res/values-w930dp/dimens.xml
+++ b/car/res/values-w930dp/dimens.xml
@@ -27,4 +27,6 @@
     <dimen name="car_keyline_2_neg">-108dp</dimen>
     <dimen name="car_keyline_3_neg">-128dp</dimen>
     <dimen name="car_keyline_4_neg">-168dp</dimen>
+    <!-- The diff between keyline 1 and keyline 3. -->
+    <dimen name="car_keyline_1_keyline_3_diff">96dp</dimen>
 </resources>