script: Move gamepad DOM interfaces to script/dom/gamepad/ (#38900)

Moves interfaces defined by the gamepad spec to the
`script/dom/gamepad/` module from `script/dom/`.

Testing: Just a refactor shouldn't need any testing
Fixes: N/A

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

components/script/dom/gamepad/gamepadbutton.rs

@@ -0,0 +1,71 @@
+/* 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/. */
+
+use std::cell::Cell;
+
+use dom_struct::dom_struct;
+
+use crate::dom::bindings::codegen::Bindings::GamepadButtonBinding::GamepadButtonMethods;
+use crate::dom::bindings::num::Finite;
+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 GamepadButton {
+    reflector_: Reflector,
+    pressed: Cell<bool>,
+    touched: Cell<bool>,
+    value: Cell<f64>,
+}
+
+impl GamepadButton {
+    pub(crate) fn new_inherited(pressed: bool, touched: bool) -> GamepadButton {
+        Self {
+            reflector_: Reflector::new(),
+            pressed: Cell::new(pressed),
+            touched: Cell::new(touched),
+            value: Cell::new(0.0),
+        }
+    }
+
+    pub(crate) fn new(
+        window: &Window,
+        pressed: bool,
+        touched: bool,
+        can_gc: CanGc,
+    ) -> DomRoot<GamepadButton> {
+        reflect_dom_object(
+            Box::new(GamepadButton::new_inherited(pressed, touched)),
+            window,
+            can_gc,
+        )
+    }
+}
+
+impl GamepadButtonMethods<crate::DomTypeHolder> for GamepadButton {
+    // https://www.w3.org/TR/gamepad/#widl-GamepadButton-pressed
+    fn Pressed(&self) -> bool {
+        self.pressed.get()
+    }
+
+    // https://www.w3.org/TR/gamepad/#widl-GamepadButton-touched
+    fn Touched(&self) -> bool {
+        self.touched.get()
+    }
+
+    // https://www.w3.org/TR/gamepad/#widl-GamepadButton-value
+    fn Value(&self) -> Finite<f64> {
+        Finite::wrap(self.value.get())
+    }
+}
+
+impl GamepadButton {
+    pub(crate) fn update(&self, pressed: bool, touched: bool, value: f64) {
+        self.pressed.set(pressed);
+        self.touched.set(touched);
+        self.value.set(value);
+    }
+}