Sync wallpaper based on sync themes setting

chrome/browser/chromeos/extensions/wallpaper_private_api.h

Index: chrome/browser/chromeos/extensions/wallpaper_private_api.h
diff --git a/chrome/browser/chromeos/extensions/wallpaper_private_api.h b/chrome/browser/chromeos/extensions/wallpaper_private_api.h
index 4b3fb0c1b143d6974f3a1131ec037faada8e307b..a5b1c3fae6f4a40d3ab9fc8bee40f6401d978654 100644
--- a/chrome/browser/chromeos/extensions/wallpaper_private_api.h
+++ b/chrome/browser/chromeos/extensions/wallpaper_private_api.h
@@ -27,6 +27,19 @@ class WallpaperPrivateGetStringsFunction : public SyncExtensionFunction {
   virtual bool RunSync() override;
 };
 
+// Check if sync themes setting is enabled.
+class WallpaperPrivateGetSyncSettingFunction : public SyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("wallpaperPrivate.getSyncSetting",
+                             WALLPAPERPRIVATE_GETSYNCSETTING)
+
+ protected:
+  virtual ~WallpaperPrivateGetSyncSettingFunction() {}
+
+  // SyncExtensionFunction overrides.
+  virtual bool RunSync() override;
+};
+
 class WallpaperPrivateSetWallpaperIfExistsFunction
     : public WallpaperFunctionBase {
  public: