Convert wallpaper picker to v2 app

chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js

Index: chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js
diff --git a/chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js b/chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js
new file mode 100644
index 0000000000000000000000000000000000000000..fbf32faddd9db0a06513925a16118a73c9b80d07
--- /dev/null
+++ b/chrome/browser/resources/chromeos/wallpaper_manager/js/event_page.js
@@ -0,0 +1,28 @@
+// Copyright (c) 2012 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.
+
+var WALLPAPER_PICKER_WIDTH = 550;
+var WALLPAPER_PICKER_HEIGHT = 420;
+
+var wallpaperPickerWindow;
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  if (wallpaperPickerWindow && !wallpaperPickerWindow.contentWindow.closed) {
+    wallpaperPickerWindow.focus();
+    chrome.wallpaperPrivate.minimizeInactiveWindows();
+    return;
+  }
+
+  chrome.app.window.create('main.html', {
+    frame: 'chrome',
+    width: WALLPAPER_PICKER_WIDTH,
+    height: WALLPAPER_PICKER_HEIGHT
+  }, function(w) {
+    wallpaperPickerWindow = w;
+    chrome.wallpaperPrivate.minimizeInactiveWindows();
+    w.onClosed.addListener(function() {
+      chrome.wallpaperPrivate.restoreMinimizedWindows();
+    });
+  });
+});