Convert wallpaper picker to v2 app

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

+// 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();

[flackr, 2012/11/12 22:00:34]

This may be a legitimate case for minimizing the other windows again.

[bshe, 2012/11/12 23:53:38]

I remember we had a double minimizing issue when we try to minimizing other
windows on focus/relaunch.
But this seems to be fine with the new private api now. So adding it back again.

On 2012/11/12 22:00:34, flackr wrote:

[flackr, 2012/11/13 02:19:07]

We may want to change chrome.wallpaperPrivate.minimizeInactiveWindows to add to
the list of minimized windows rather than replace it to accomodate this.

[bshe, 2012/11/13 15:24:46]

Done. PTAL at the latest patchset.

On 2012/11/13 02:19:07, flackr wrote:

+    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();
+    });
+  });
+});