Add WindowPinType property on arua::Window

services/ui/public/interfaces/window_manager.mojom

Index: services/ui/public/interfaces/window_manager.mojom
diff --git a/services/ui/public/interfaces/window_manager.mojom b/services/ui/public/interfaces/window_manager.mojom
index 5d6c169ca222254745533e2f9381c05772ca97b1..455c0575d72185c0415d5f72d5ed9f01dd0bb59a 100644
--- a/services/ui/public/interfaces/window_manager.mojom
+++ b/services/ui/public/interfaces/window_manager.mojom
@@ -144,6 +144,9 @@ interface WindowManager {
   // The window icon; typically 16x16 for titlebars. Type: SkBitmap
   const string kWindowIcon_Property = "prop:window-icon";
 
+  // The window's pin type. Maps to aura::client::kWindowPinType.
+  const string kWindowPinType_Property = "prop:window-pin-type";
+
   // The window's title. Maps to aura::client::kTitleKey. Type: mojom::String
   const string kWindowTitle_Property = "prop:window-title";