Set focusibility correctly when initializing a window in mus+ash.

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 14ad1c061e8c5a092debdbe04a46c6b92274ce7b..a8ad50e23134b9fade387c4fd89896fd4e046058 100644
--- a/services/ui/public/interfaces/window_manager.mojom
+++ b/services/ui/public/interfaces/window_manager.mojom
@@ -35,6 +35,9 @@ interface WindowManager {
 
   // Properties used only during creation time. --------------------------------
 
+  // Whether the window should be initially focusable or not. Type: bool.
+  const string kFocusable_InitProperty = "init:focusable";
+
   // Initial bounds to create the window at. If empty the WindowManager decides
   // the initial bounds. Type: gfx::Rect.
   const string kBounds_InitProperty = "init:bounds";
@@ -169,6 +172,8 @@ interface WindowManager {
                 string name,
                 array<uint8>? value);
 
+  WmSetCanFocus(uint32 window_id, bool can_focus);
+
   // Asks the WindowManager to create a new window.
   // |requesting_client_id| is the id of the client issuing the request. This
   // allows the window manager to track top level windows by client.