Validate incoming window properties.

chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc

Index: chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
diff --git a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
index c09617c3cc23de781dde79365282e5c2d0bb764e..6884dfe76a769efec0f44347f45904e885b39f51 100644
--- a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
+++ b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
@@ -45,12 +45,15 @@ void ChromeBrowserMainExtraPartsAsh::ServiceManagerConnectionStarted(
     views::MusClient* mus_client = views::MusClient::Get();
     aura::WindowTreeClientDelegate* delegate = mus_client;
     aura::PropertyConverter* converter = delegate->GetPropertyConverter();
+
     converter->RegisterProperty(
         ash::kPanelAttachedKey,
-        ui::mojom::WindowManager::kPanelAttached_Property);
+        ui::mojom::WindowManager::kPanelAttached_Property,
+        aura::PropertyConverter::AcceptAnyValue());
     converter->RegisterProperty(
         ash::kShelfItemTypeKey,
-        ui::mojom::WindowManager::kShelfItemType_Property);
+        ui::mojom::WindowManager::kShelfItemType_Property,
+        ash::ValidateShelfItemType());
 
     mus_client->SetMusPropertyMirror(
         base::MakeUnique<ash::MusPropertyMirrorAsh>());