script: Move WebGL DOM interfaces to script/dom/webgl/ (#38995)

Move interfaces defined by the WebGL spec to the `script/dom/webgl/
`module from `script/dom/`.

`script/dom/webgl*.rs` -> `script/dom/webgl/`
`script/dom/webgl_extensions` -> `script/dom/webgl/extensions`
`script/dom/webgl_validations` -> `script/dom/webgl/validations`

Testing: No changes, just a refactoring

Fixes (partially): #38901

Signed-off-by: Andrei Volykhin <volykhin.andrei@huawei.com>
Co-authored-by: Andrei Volykhin <volykhin.andrei@huawei.com>

components/script/dom/webgl/webglshaderprecisionformat.rs

@@ -0,0 +1,66 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+#![allow(dead_code)]
+
+// https://www.khronos.org/registry/webgl/specs/latest/1.0/webgl.idl
+use dom_struct::dom_struct;
+
+use crate::dom::bindings::codegen::Bindings::WebGLShaderPrecisionFormatBinding::WebGLShaderPrecisionFormatMethods;
+use crate::dom::bindings::reflector::{Reflector, reflect_dom_object};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::window::Window;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) struct WebGLShaderPrecisionFormat {
+    reflector_: Reflector,
+    range_min: i32,
+    range_max: i32,
+    precision: i32,
+}
+
+impl WebGLShaderPrecisionFormat {
+    fn new_inherited(range_min: i32, range_max: i32, precision: i32) -> WebGLShaderPrecisionFormat {
+        WebGLShaderPrecisionFormat {
+            reflector_: Reflector::new(),
+            range_min,
+            range_max,
+            precision,
+        }
+    }
+
+    pub(crate) fn new(
+        window: &Window,
+        range_min: i32,
+        range_max: i32,
+        precision: i32,
+        can_gc: CanGc,
+    ) -> DomRoot<WebGLShaderPrecisionFormat> {
+        reflect_dom_object(
+            Box::new(WebGLShaderPrecisionFormat::new_inherited(
+                range_min, range_max, precision,
+            )),
+            window,
+            can_gc,
+        )
+    }
+}
+
+impl WebGLShaderPrecisionFormatMethods<crate::DomTypeHolder> for WebGLShaderPrecisionFormat {
+    // https://www.khronos.org/registry/webgl/specs/1.0/#5.12.1
+    fn RangeMin(&self) -> i32 {
+        self.range_min
+    }
+
+    // https://www.khronos.org/registry/webgl/specs/1.0/#5.12.1
+    fn RangeMax(&self) -> i32 {
+        self.range_max
+    }
+
+    // https://www.khronos.org/registry/webgl/specs/1.0/#5.12.1
+    fn Precision(&self) -> i32 {
+        self.precision
+    }
+}