Add associated binding set. Add associated_binding.html layout test.

mojo/public/js/bindings.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define("mojo/public/js/bindings", [
   "mojo/public/js/core",
   "mojo/public/js/interface_types",
   "mojo/public/js/lib/interface_endpoint_client",
   "mojo/public/js/router",
 ], function(core, types, interfaceEndpointClient, router) {
@@ skipping 247 matching lines @@
   };
 
   // ---------------------------------------------------------------------------
 
   function BindingSetEntry(bindingSet, interfaceType, impl, requestOrHandle,
                            bindingId) {
     this.bindingSet_ = bindingSet;
     this.bindingId_ = bindingId;
     this.binding_ = new Binding(interfaceType, impl, requestOrHandle);
 
-    this.binding_.setConnectionErrorHandler(function() {
-      this.bindingSet_.onConnectionError(bindingId);
+    this.binding_.setConnectionErrorHandler(function(reason) {
+      this.bindingSet_.onConnectionError(bindingId, reason);
     }.bind(this));
   }
 
   BindingSetEntry.prototype.close = function() {
     this.binding_.close();
   };
 
   function BindingSet(interfaceType) {
     this.interfaceType_ = interfaceType;
     this.nextBindingId_ = 0;
@@ skipping 16 matching lines @@
   BindingSet.prototype.closeAllBindings = function() {
     for (var entry of this.bindings_.values())
       entry.close();
     this.bindings_.clear();
   };
 
   BindingSet.prototype.setConnectionErrorHandler = function(callback) {
     this.errorHandler_ = callback;
   };
 
-  BindingSet.prototype.onConnectionError = function(bindingId) {
+  BindingSet.prototype.onConnectionError = function(bindingId, reason) {
     this.bindings_.delete(bindingId);
 
     if (this.errorHandler_)
-      this.errorHandler_();
+      this.errorHandler_(reason);
   };
 
   var exports = {};
   exports.InterfacePtrInfo = types.InterfacePtrInfo;
   exports.InterfaceRequest = types.InterfaceRequest;
   exports.makeRequest = makeRequest;
   exports.InterfacePtrController = InterfacePtrController;
   exports.Binding = Binding;
   exports.BindingSet = BindingSet;
 
   return exports;
 });