Apply default wallpaper from customization manifest.

chrome/browser/chromeos/customization_document.h

Index: chrome/browser/chromeos/customization_document.h
diff --git a/chrome/browser/chromeos/customization_document.h b/chrome/browser/chromeos/customization_document.h
index 1c0ea8fcea6290bae9a6409e71e68219474bb138..5426e0f47292a72f39e329189faa60835d220663 100644
--- a/chrome/browser/chromeos/customization_document.h
+++ b/chrome/browser/chromeos/customization_document.h
@@ -42,6 +42,7 @@ void Test__InitStartupCustomizationDocument(const std::string& manifest);
 
 namespace chromeos {
 
+class CustomizationWallpaperDownloader;
 class ServicesCustomizationExternalLoader;
 
 namespace system {
@@ -179,6 +180,11 @@ class ServicesCustomizationDocument : public CustomizationDocument,
   // Remove instance of ServicesCustomizationDocument for tests.
   static void ShutdownForTesting();
 
+  // This is also used by WallpaperManager to set customized wallpaper path

[Nikita (slow), 2014/04/15 12:39:24]

Comments needs to be updated. It says that these methods are used to set while
these methods are Get*()

[Alexander Alekseev, 2014/04/15 22:47:31]

Done.

+  // to global default before first wallpaper is shown.
+  static base::FilePath GetCustomizedWallpaperCacheDir();
+  static base::FilePath GetCustomizedWallpaperDownloadedFileName();
+
  private:
   friend struct DefaultSingletonTraits<ServicesCustomizationDocument>;
 
@@ -237,6 +243,23 @@ class ServicesCustomizationDocument : public CustomizationDocument,
       const std::string& locale,
       const base::DictionaryValue& root) const;
 
+  // Start download of wallpaper image if needed.
+  void StartOEMWallpaperDownload(const GURL& wallpaper_url);
+
+  // Check downloaded wallpaper and start download if needed.

[Nikita (slow), 2014/04/15 12:39:24]

nit:
start applying? or it does redownload as well?

[Alexander Alekseev, 2014/04/15 22:47:31]

If we do not have final two rescaled wallpaper files matching
wallpaper URL from customization manifest, wallpaper will be downloaded again.
There is no restart "in the middle of the process".

+  void CheckAndApplyWallpaper();

[Nikita (slow), 2014/04/15 12:39:24]

nit: What does "check" mean in this context?

[Alexander Alekseev, 2014/04/15 22:47:31]

Check that current customized wallpaper cache exists and matches manifest.

+
+  // Intermediate function to pass the result of PathExists to ApplyWallpaper.
+  void OnCheckedWallpaperCacheExists(scoped_ptr<bool> exists);
+
+  // Called after downloaded wallpaper has been checked.
+  void ApplyWallpaper(bool default_wallpaper_file_exists);
+
+  // Set Shell default wallpaper to customized.
+  // It's wrapped as a callback and passed as a parameter to
+  // CustomizationWallpaperDownloader.
+  void OnCustomizedWallpaperDownloaded(bool success, const GURL& wallpaper_url);

[Nikita (slow), 2014/04/15 12:39:24]

nit: Rename to OnOEMWallpaperDownloaded() to match
StartOEMWallpaperDownload()

[Alexander Alekseev, 2014/04/15 22:47:31]

Done.

+
   // Services customization manifest URL.
   GURL url_;
 
@@ -255,6 +278,8 @@ class ServicesCustomizationDocument : public CustomizationDocument,
   // Known external loaders.
   ExternalLoaders external_loaders_;
 
+  scoped_ptr<CustomizationWallpaperDownloader> wallpaper_downloader_;
+
   // Weak factory for callbacks.
   base::WeakPtrFactory<ServicesCustomizationDocument> weak_ptr_factory_;