DO NOT MERGE Make labels view have grey app bar

Bug: 31268067

Test: manual
  - navigate b/w fragments + rotate screen
  - create a new label and delete a label
  - enter/exit edit mode of group fragment and contacts fragment

Change-Id: Ie4bc38456dae8840df3ae511c2fbbd0d336038bc
(cherry picked from commit 3dd13761f1c2c615004af129afa5ebc56efe8ada)
diff --git a/res/values/colors.xml b/res/values/colors.xml
index 081d579..d62f0f8 100644
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@@ -42,6 +42,9 @@
     <color name="primary_color_dark">#0277bd</color>
     <color name="primary_color">#0288d1</color>
 
+    <color name="group_primary_color_dark">#546E7A</color>
+    <color name="group_primary_color">#607D8B</color>
+
     <!-- Color of the selected tab underline -->
     <color name="contacts_accent_color">#FFFFFF</color>