config_service: make UI adjustable for mobile

appengine/config_service/ui/common/auth-signin.html

Index: appengine/config_service/ui/common/auth-signin.html
diff --git a/appengine/config_service/ui/common/auth-signin.html b/appengine/config_service/ui/common/auth-signin.html
index 4a1f091ea988122b97fb3217e16f128a6bd9131a..6504162a6cdd9e4becc625ec7de8580b6d10bd0a 100644
--- a/appengine/config_service/ui/common/auth-signin.html
+++ b/appengine/config_service/ui/common/auth-signin.html
@@ -55,7 +55,7 @@
     <template is="dom-if" if="[[!signed_in]]">
       <div id="signinContainer">
         <!-- TODO(cwpayton): Before official deployment, change href to "/#/" -->
-        <a class="typeface" on-tap="signIn" href="/#/">Sign in</a>
+        <a class="typeface" on-tap="signIn" href="[[current_url]]">Sign in</a>
       </div>
     </template>
 
@@ -88,6 +88,11 @@
           type: String
         },
 
+        current_url: {
+          type: String,
+          value: "/#/"
+        },
+
         initialized: {
           type: Boolean,
           value: false,
@@ -165,6 +170,7 @@
       },
 
       signIn: function() {
+        this.current_url = window.location.href;
         this.$.aware.signIn();
       },