arc: Enable silent PlayStore Sign-In.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index aae209d121deacac3c7f46800b9a6dce2e42b28c..a379b4dcb0f37fce28688051c33f54b35d6525c1 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -13580,6 +13580,18 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
         Enables the browser task scheduler to dispatch tasks instead of the existing worker pools. The browser task scheduler will only be used if variation parameters are available.
       </message>
 
+      <!-- Arc authorization -->
+      <message name="IDS_FLAGS_ARC_USE_AUTH_ENDPOINT_NAME"

[xiyuan, 2016/09/07 21:07:55]

Can we put these under a <if expr="chromeos"> ?

[khmel, 2016/09/07 23:08:53]

Missed this, thanks

+               desc="Name of about:flag option to control the arc authorization endpoint."
+               translateable="false">
+        Android apps authorization point
+      </message>
+      <message name="IDS_FLAGS_ARC_USE_AUTH_ENDPOINT_DESCRIPTION"
+               desc="Desciption of about:flag option to control the arc authorization endpoint."
+               translateable="false">
+        Enable Android apps authorization point to automatic sign-in in OptIn flow.
+      </message>
+
       <!-- Windows 8 Metro mode. -->
       <if expr="is_win">
         <message name="IDS_METRO_FLOW_DESCRIPTION"