[Chrome OS] Implement the device wallpaper policy.

chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h

Index: chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h
diff --git a/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h b/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h
index 206bcfef59cdcdbc00b4f32743db763bd0f3e87e..f4c1a9523d2f96cc2f00b667069fab56c9046928 100644
--- a/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h
+++ b/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager.h
@@ -13,6 +13,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/customization/customization_wallpaper_downloader.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "components/user_manager/user.h"
 #include "components/user_manager/user_image/user_image.h"
@@ -81,6 +82,7 @@ class WallpaperManager
   size_t GetPendingListSizeForTesting() const override;
   wallpaper::WallpaperFilesId GetFilesId(
       const AccountId& account_id) const override;
+  bool SetDeviceWallpaperIfApplicable(const AccountId& account_id) override;
 
   // ash::mojom::WallpaperPicker:
   void Open() override;
@@ -115,10 +117,40 @@ class WallpaperManager
       const AccountId& account_id,
       std::unique_ptr<user_manager::UserImage> user_image);
 
+  // This is called when the device wallpaper policy changes.
+  void OnDeviceWallpaperPolicyChanged();
+  // This is call after checking if the device wallpaper exists.
+  void OnDeviceWallpaperExists(const AccountId& account_id,
+                               const std::string& url,
+                               const std::string& hash,
+                               bool exist);
+  // This is called after the device wallpaper is download (either successful or
+  // failed).
+  void OnDeviceWallpaperDownloaded(const AccountId& account_id,
+                                   const std::string& hash,
+                                   bool success,
+                                   const GURL& url);
+  // Check if the device wallpaper matches the hash that's provided in the
+  // device wallpaper policy setting.
+  void OnCheckDeviceWallpaperMatchHash(const AccountId& account_id,
+                                       const std::string& url,
+                                       const std::string& hash,
+                                       bool match);
+  // This is called when the device wallpaper is decoded successfully.
+  void OnDeviceWallpaperDecoded(
+      const AccountId& account_id,
+      std::unique_ptr<user_manager::UserImage> user_image);
+
   // wallpaper::WallpaperManagerBase:
   void InitializeRegisteredDeviceWallpaper() override;
   bool GetUserWallpaperInfo(const AccountId& account_id,
                             wallpaper::WallpaperInfo* info) const override;
+  // Returns true if the device wallpaper should be set for the account.
+  bool ShouldSetDeviceWallpaper(const AccountId& account_id,
+                                std::string* url,
+                                std::string* hash) override;
+  base::FilePath GetDeviceWallpaperDir() override;
+  base::FilePath GetDeviceWallpaperFilePath() override;
   void OnWallpaperDecoded(
       const AccountId& account_id,
       wallpaper::WallpaperLayout layout,
@@ -165,6 +197,12 @@ class WallpaperManager
   std::unique_ptr<CrosSettings::ObserverSubscription>
       show_user_name_on_signin_subscription_;
 
+  std::unique_ptr<CrosSettings::ObserverSubscription>
+      device_wallpaper_image_subscription_;
+  std::unique_ptr<CustomizationWallpaperDownloader>
+      device_wallpaper_downloader_;
+  bool retry_download_if_failed_ = true;
+
   // Pointer to last inactive (waiting) entry of 'loading_' list.
   // NULL when there is no inactive request.
   PendingWallpaper* pending_inactive_;