Add new WebGLPolygonMode extension. (#12026)

https://registry.khronos.org/webgl/extensions/WEBGL_polygon_mode/

Co-authored-by: borisrp <borisrp@shirogames.com>

std/js/html/webgl/extension/WEBGLPolygonMode.hx

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C)2005-2025 Haxe Foundation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+package js.html.webgl.extension;
+
+/**
+	This extension exposes the ANGLE_polygon_mode functionality to WebGL.
+	There are no WebGL-specific behavioral changes.
+**/
+@:native("WEBGL_polygon_mode ")
+extern class WEBGLPolygonMode  {
+
+	static inline var POLYGON_MODE_WEBGL : Int = 2880;
+	static inline var POLYGON_OFFSET_LINE_WEBGL : Int = 10754;
+	static inline var LINE_WEBGL : Int = 6913;
+	static inline var FILL_WEBGL : Int = 6914;
+
+	/**
+		Face must be FRONT_AND_BACK.
+		Mode must be LINE_WEBGL or FILL_WEBGL (default).
+	**/
+	function polygonModeWEBGL( face : Int, mode : Int ) : Void;
+}