Implement WebGL extensions.

components/script/dom/webgl_extensions/extension.rs

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use dom::bindings::js::Root;
+use dom::bindings::reflector::DomObject;
+use dom::bindings::trace::JSTraceable;
+use dom::webglrenderingcontext::WebGLRenderingContext;
+use super::WebGLExtensions;
+
+/// Trait implemented by WebGL extensions.
+pub trait WebGLExtension: Sized where Self::Extension: DomObject + JSTraceable {
+    type Extension;
+
+    /// Creates the DOM object of the WebGL extension.
+    fn new(ctx: &WebGLRenderingContext) -> Root<Self::Extension>;
+
+    /// Checks if the extension is supported.
+    fn is_supported(ext: &WebGLExtensions) -> bool;
+
+    /// Enable the extension.
+    fn enable(ext: &WebGLExtensions);
+
+    /// Name of the WebGL Extension.
+    fn name() -> &'static str;
+}