DevTools: Introduce Target class which holds connection & models

Source/devtools/front_end/InspectorBackend.js

Index: Source/devtools/front_end/InspectorBackend.js
diff --git a/Source/devtools/front_end/InspectorBackend.js b/Source/devtools/front_end/InspectorBackend.js
index e8c948d194365b56897d70fd8c093da3e3ec2b88..c61f84a529094ec08525e644b8ffde4d6c731d0c 100644
--- a/Source/devtools/front_end/InspectorBackend.js
+++ b/Source/devtools/front_end/InspectorBackend.js
@@ -38,10 +38,46 @@ function InspectorBackendClass()
     this._dispatcherPrototypes = {};
     this._initialized = false;
     this._enums = {};
+    this._initProtocolAgentsConstructor();
 }
 
 InspectorBackendClass.prototype = {
 
+    _initProtocolAgentsConstructor: function()
+    {
+        window.Protocol = {};
+
+        /**
+         * @constructor
+         * @param {!Object.<string, !Object>} agentsMap
+         */
+        window.Protocol.Agents = function(agentsMap) {
+            this._agentsMap = agentsMap;
+        };
+    },
+
+    /**
+     * @param {string} domain
+     */
+    _addAgentGetterMethodToProtocolAgentsPrototype: function(domain)
+    {
+        var upperCaseLength = 0;
+        while (upperCaseLength < domain.length && domain[upperCaseLength].toLowerCase() !== domain[upperCaseLength])
+            ++upperCaseLength;
+
+        var methodName = domain.substr(0, upperCaseLength).toLowerCase() + domain.slice(upperCaseLength) + "Agent";
+
+        /**
+         * @this {Protocol.Agents}
+         */
+        function agentGetter()
+        {
+            return this._agentsMap[domain];
+        }
+
+        window.Protocol.Agents.prototype[methodName] = agentGetter;
+    },
+
     /**
      * @return {!InspectorBackendClass.Connection}
      */
@@ -73,8 +109,10 @@ InspectorBackendClass.prototype = {
      */
     _agentPrototype: function(domain)
     {
-        if (!this._agentPrototypes[domain])
+        if (!this._agentPrototypes[domain]) {
             this._agentPrototypes[domain] = new InspectorBackendClass.AgentPrototype(domain);
+            this._addAgentGetterMethodToProtocolAgentsPrototype(domain);
+        }
 
         return this._agentPrototypes[domain];
     },
@@ -338,6 +376,14 @@ InspectorBackendClass.Connection.prototype = {
     },
 
     /**
+     * @return {!Object.<string, !Object>}
+     */
+    agentsMap: function()
+    {
+        return this._agents;
+    },
+
+    /**
      * @param {string} domain
      * @param {string} method
      * @param {?Object} params