[DevTools] Consolidate overlay-related functionality in Overlay domain

third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js

 if (window.GCController)
     GCController.collectAll();
 
 var initialize_InspectorTest = function() {
 Protocol.InspectorBackend.Options.suppressRequestErrors = true;
 var results = [];
 
 function consoleOutputHook(messageType)
 {
     InspectorTest.addResult(messageType + ": " + Array.prototype.slice.call(arguments, 1));
@@ skipping 960 matching lines @@
             return;
         InspectorTest.CSSAgent = target.cssAgent();
         InspectorTest.DeviceOrientationAgent = target.deviceOrientationAgent();
         InspectorTest.DOMAgent = target.domAgent();
         InspectorTest.DOMDebuggerAgent = target.domdebuggerAgent();
         InspectorTest.DebuggerAgent = target.debuggerAgent();
         InspectorTest.EmulationAgent = target.emulationAgent();
         InspectorTest.HeapProfilerAgent = target.heapProfilerAgent();
         InspectorTest.InspectorAgent = target.inspectorAgent();
         InspectorTest.NetworkAgent = target.networkAgent();
+        InspectorTest.OverlayAgent = target.overlayAgent();
         InspectorTest.PageAgent = target.pageAgent();
         InspectorTest.ProfilerAgent = target.profilerAgent();
         InspectorTest.RuntimeAgent = target.runtimeAgent();
         InspectorTest.TargetAgent = target.targetAgent();
 
         InspectorTest.networkManager = target.model(SDK.NetworkManager);
         InspectorTest.securityOriginManager = target.model(SDK.SecurityOriginManager);
         InspectorTest.resourceTreeModel = target.model(SDK.ResourceTreeModel);
         InspectorTest.debuggerModel = target.model(SDK.DebuggerModel);
         InspectorTest.runtimeModel = target.model(SDK.RuntimeModel);
         InspectorTest.domModel = target.model(SDK.DOMModel);
         InspectorTest.domDebuggerModel = target.model(SDK.DOMDebuggerModel);
         InspectorTest.cssModel = target.model(SDK.CSSModel);
         InspectorTest.cpuProfilerModel = target.model(SDK.CPUProfilerModel);
+        InspectorTest.overlayModel = target.model(SDK.OverlayModel);
         InspectorTest.serviceWorkerManager = target.model(SDK.ServiceWorkerManager);
         InspectorTest.tracingManager = target.model(SDK.TracingManager);
         InspectorTest.mainTarget = target;
         InspectorTest.consoleModel = ConsoleModel.consoleModel;
         InspectorTest.networkLog = NetworkLog.networkLog;
     },
 
     targetRemoved: function(target) { }
 });
 
@@ skipping 241 matching lines @@
     _output("[page] " + text);
 }
 
 function _output(result)
 {
     if (!outputElement)
         createOutputElement();
     outputElement.appendChild(document.createTextNode(result));
     outputElement.appendChild(document.createElement("br"));
 }