Chrome OS wallpaper manager.

Rename transparentBackground -> alphaEnabled and set corresponding permissions.

This is in response to r288983.

BUG=403166
TEST=verify wallpaper picker works on Chrome OS.
R=bshe@chromium.org

Review URL: https://codereview.chromium.org/465113003

Cr-Commit-Position: refs/heads/master@{#289316}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289316 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -150,7 +150,7 @@ SurpriseWallpaper.prototype.setRandomWallpaper_ = function(dateString) {
             Constants.AccessLastSurpriseWallpaperChangedDate,
             dateString,
             true);
-      }
+      };
       WallpaperUtil.setOnlineWallpaper(wallpaperURL, wallpaper.default_layout,
           onSuccess, self.retryLater_.bind(self));
     }
@@ -225,7 +225,7 @@ chrome.app.runtime.onLaunched.addListener(function() {
     width: WALLPAPER_PICKER_WIDTH,
     height: WALLPAPER_PICKER_HEIGHT,
     resizable: false,
-    transparentBackground: true
+    alphaEnabled: true
   }, function(w) {
     wallpaperPickerWindow = w;
     chrome.wallpaperPrivate.minimizeInactiveWindows();

chrome/browser/resources/chromeos/wallpaper_manager/manifest.json

@@ -12,6 +12,7 @@
   },
   "permissions": [
     "alarms",
+    "app.window.alpha",
     "experimental",
     "storage",
     "unlimitedStorage",