Lower tab underline to 2dp.

Bug: 15859047
Change-Id: I214de3392989b2710a45547f7bb1da3c602fd929
diff --git a/res-common/values/dimens.xml b/res-common/values/dimens.xml
index 942b2c8..4d81b81 100644
--- a/res-common/values/dimens.xml
+++ b/res-common/values/dimens.xml
@@ -112,8 +112,8 @@
     <dimen name="floating_action_button_dialpad_margin_bottom_offset">4dp</dimen>
 
     <!-- Height of the selection indicator of a tab. -->
-    <dimen name="tab_selected_underline_height">3dp</dimen>
-    <dimen name="tab_selected_underline_height_negative">-3dp</dimen>
+    <dimen name="tab_selected_underline_height">2dp</dimen>
+    <dimen name="tab_selected_underline_height_negative">-2dp</dimen>
     <!-- Size of text in tabs. -->
     <dimen name="tab_text_size">14sp</dimen>