Revert of Revert of DevTools: Remove pageAgent() call from DebuggerModel

Source/devtools/front_end/main/OverlayController.js

Index: Source/devtools/front_end/main/OverlayController.js
diff --git a/Source/devtools/front_end/main/OverlayController.js b/Source/devtools/front_end/main/OverlayController.js
new file mode 100644
index 0000000000000000000000000000000000000000..cf8eb1bfaf6b37395745f00d173341722682a6de
--- /dev/null
+++ b/Source/devtools/front_end/main/OverlayController.js
@@ -0,0 +1,27 @@
+// Copyright 2015 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.
+
+/**
+ * @constructor
+ */
+WebInspector.OverlayController = function()
+{
+    WebInspector.settings.disablePausedStateOverlay.addChangeListener(this._updateOverlayMessage, this);
+    WebInspector.targetManager.addModelListener(WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.DebuggerPaused, this._updateOverlayMessage, this);
+    WebInspector.targetManager.addModelListener(WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.DebuggerResumed, this._updateOverlayMessage, this);
+    WebInspector.targetManager.addModelListener(WebInspector.DebuggerModel, WebInspector.DebuggerModel.Events.GlobalObjectCleared, this._updateOverlayMessage, this);
+}
+
+WebInspector.OverlayController.prototype = {
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _updateOverlayMessage: function(event)
+    {
+        var debuggerModel = /** @type {!WebInspector.DebuggerModel} */ (event.target);
+        var message = debuggerModel.isPaused() && !WebInspector.settings.disablePausedStateOverlay.get() ? WebInspector.UIString("Paused in debugger") : undefined;
+        debuggerModel.target().pageAgent().setOverlayMessage(message);
+    }
+}