RTL the conversation list and two pane layout.

Fixes:
b/12451886
b/12452546

Change-Id: If2bd3d63c07eda3190d16fd95746c0105b251406
diff --git a/res/values/constants.xml b/res/values/constants.xml
index 1dd9b84..0ad4e5a 100644
--- a/res/values/constants.xml
+++ b/res/values/constants.xml
@@ -131,4 +131,7 @@
     <integer name="vacation_responder_subject_length">500</integer>
     <!-- Number of characters allowed for a vacation responder body. -->
     <integer name="vacation_responder_body_length">1024000</integer>
+
+    <!-- Angle of the shadow that appears at the edge of the folder list. 180 is right to left. -->
+    <integer name="two_pane_folder_edge_gradient_angle">180</integer>
 </resources>