Add bg gpu timer display

examples/utilities/tools/render/BG.qml

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+//
+//  BG.qml
+//  examples/utilities/tools/render
+//
+//  Created by Zach Pomerantz on 2/8/2016
+//  Copyright 2016 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or https://www.apache.org/licenses/LICENSE-2.0.html
+//
+import QtQuick 2.5
+import QtQuick.Controls 1.4
+
+Item {
+    Timer {
+        running: true; repeat: true
+        onTriggered: time.text = Render.getConfig("DrawBackgroundDeferred").gpuTime
+    }
+
+    Text { id: time; font.pointSize: 20 }
+}
+

examples/utilities/tools/render/debugBG.js

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+//
+//  debugBG.js
+//  examples/utilities/tools/render
+//
+//  Zach Pomerantz, created on 1/27/2016.
+//  Copyright 2016 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+// Set up the qml ui
+var qml = Script.resolvePath('BG.qml');
+var window = new OverlayWindow({
+    title: 'Background Timer',
+    source: qml,
+    width: 300
+});
+window.setPosition(25, 50);
+window.closed.connect(function() { Script.stop(); });
+