LibWeb: Stub out the HTML TimeRanges IDL interface

This is used by media elements. Provide a stub for websites which depend
on the interface existing.

Userland/Libraries/LibWeb/HTML/TimeRanges.cpp

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/TimeRangesPrototype.h>
+#include <LibWeb/HTML/TimeRanges.h>
+
+namespace Web::HTML {
+
+TimeRanges::TimeRanges(JS::Realm& realm)
+    : Base(realm)
+{
+}
+
+JS::ThrowCompletionOr<void> TimeRanges::initialize(JS::Realm& realm)
+{
+    MUST_OR_THROW_OOM(Base::initialize(realm));
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::TimeRangesPrototype>(realm, "TimeRanges"));
+
+    return {};
+}
+
+// https://html.spec.whatwg.org/multipage/media.html#dom-timeranges-length
+size_t TimeRanges::length() const
+{
+    // FIXME: The length IDL attribute must return the number of ranges represented by the object.
+    return 0;
+}
+
+// https://html.spec.whatwg.org/multipage/media.html#dom-timeranges-start
+double TimeRanges::start(u32) const
+{
+    // FIXME: The start(index) method must return the position of the start of the indexth range represented by the object,
+    //        in seconds measured from the start of the timeline that the object covers.
+    return 0.0;
+}
+
+// https://html.spec.whatwg.org/multipage/media.html#dom-timeranges-end
+double TimeRanges::end(u32) const
+{
+    // FIXME: The end(index) method must return the position of the end of the indexth range represented by the object,
+    //        in seconds measured from the start of the timeline that the object covers.
+    return 0.0;
+}
+
+}

Userland/Libraries/LibWeb/HTML/TimeRanges.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Forward.h>
+#include <LibWeb/Bindings/PlatformObject.h>
+
+namespace Web::HTML {
+
+class TimeRanges final : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(TimeRanges, Bindings::PlatformObject);
+
+public:
+    size_t length() const;
+    double start(u32 index) const;
+    double end(u32 index) const;
+
+private:
+    explicit TimeRanges(JS::Realm&);
+
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+};
+
+}

Userland/Libraries/LibWeb/HTML/TimeRanges.idl

@@ -0,0 +1,7 @@
+// https://html.spec.whatwg.org/multipage/media.html#timeranges
+[Exposed=Window]
+interface TimeRanges {
+    readonly attribute unsigned long length;
+    double start(unsigned long index);
+    double end(unsigned long index);
+};