Add window management permission kind

Author: vickiez

specs/PermissionManagement.md

@@ -18,7 +18,8 @@ events for some permission kinds.
 The new APIs, `SetPermission` and `GetNonDefaultPermissionSettings`, provide
 all the information necessary to build a permission management page where a
 user can view and modify existing site permissions. The new permission kinds we will
-support are: local font list, automatic downloads, media autoplay, file editing, and system exclusive MIDI messages.
+support are: local font list, automatic downloads, media autoplay, file editing,
+system exclusive MIDI messages, and window management.
 
 See already supported [permission kinds](https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2?view=webview2-1.0.1418.22#corewebview2_permission_kind)
 and existing [event args](https://learn.microsoft.com/en-us/dotnet/api/microsoft.web.webview2.core.corewebview2permissionrequestedeventargs?view=webview2-dotnet-1.0.1418.22).
@@ -385,6 +386,11 @@ typedef enum COREWEBVIEW2_PERMISSION_KIND {
   /// when developers use the [Web MIDI API](https://developer.mozilla.org/en-US/docs/Web/API/Web_MIDI_API)
   /// to request access to system exclusive MIDI messages.
   COREWEBVIEW2_PERMISSION_KIND_MIDI_SYSTEM_EXCLUSIVE_MESSAGES,
+
+  /// Indicates permission to open and place windows on the screen. Permission is
+  /// requested when developers use the [Multi-Screen Window Placement API](https://www.w3.org/TR/window-placement/)
+  /// to get screen details.
+  COREWEBVIEW2_PERMISSION_KIND_WINDOW_MANAGEMENT,
 } COREWEBVIEW2_PERMISSION_KIND;
 
 /// This is a continuation of the `ICoreWebView2PermissionRequestedEventArgs`
@@ -515,6 +521,11 @@ namespace Microsoft.Web.WebView2.Core
         // when developers use the [Web MIDI API](https://developer.mozilla.org/en-US/docs/Web/API/Web_MIDI_API)
         // to request access to system exclusive MIDI messages.
         MidiSystemExclusiveMessages = 11,
+
+        // Indicates permission to open and place windows on the screen. Permission is
+        // requested when developers use the [Multi-Screen Window Placement API](https://www.w3.org/TR/window-placement/)
+        // to get screen details.
+        WindowManagement = 12,
     };
 }