Add sign-in and token retrieval to Blimp

blimp/client/android/java/strings/android_blimp_strings.grd

Index: blimp/client/android/java/strings/android_blimp_strings.grd
diff --git a/blimp/client/android/java/strings/android_blimp_strings.grd b/blimp/client/android/java/strings/android_blimp_strings.grd
index 715bd68e62051141da793353f8874bc07107c47b..c245fe4473ab15af5e3a47ac548729cfddb26181 100644
--- a/blimp/client/android/java/strings/android_blimp_strings.grd
+++ b/blimp/client/android/java/strings/android_blimp_strings.grd
@@ -94,6 +94,15 @@
   <release allow_pseudo="false" seq="1">
     <messages fallback_to_english="true">
       <!-- NOTE: Please add translateable="false" to all strings for now. -->
+      <message name="IDS_SIGNIN_GET_TOKEN_FAILED" desc="Message for when authenticating a user failed.">
+        Unable to authenticate user.
+      </message>
+      <message name="IDS_SIGNIN_GET_TOKEN_SUCCEEDED" desc="Message for when authenticating user was successful.">
+        Token retrieved.
+      </message>
+      <message name="IDS_SIGNIN_CHOOSER_DESCRIPTION" desc="Message shown with the Android signin chooser screen.">
+        Please choose an account to use with Blimp.
+      </message>
     </messages>
   </release>
 </grit>