Rewrite LogDog log viewer app.

web/inc/logdog-app-base/logdog-app-base.html

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
   -->
 
 <script>
   /**
    * Basic common LogDog application functionality.
    *
    * @param {window} window the application window to bind to
    */
   LogDogApp = function(window) {
     // Set up our default LogDog host.
     this.host = window.location.hostname;
     if (this.host === "localhost") {
       // Running locally. Bind to our development instance.
       this.host = "luci-logdog-dev.appspot.com";
     }
 
     this.production = (window.location.port === "");
+
+    // Sets app default base URL.
+    this.baseUrl = window.location.pathname;
   };
 
   /**
    * Returns an Array of values for a given query parameter.
    *
    * For example, if the query parameter was, "...?a=asdf&a=qwer", this would
    * return ["asdf", "qwer"].
    *
    * @param {string} q the query parameter text.
    * @param {string} key the query parameter key to extract.
@@ skipping 39 matching lines @@
    * @param {string} v the stream path value
    * @returns {string} the fixed stream path value
    */
   LogDogApp.prototype.correctStreamPath = function(v) {
     return v.replace(" ", "+");
   };
 
   /** Global LogDogApp instance bound to the current window. */
   var logdog = new LogDogApp(window);
 </script>