Initial steps for CSSOM API

components/script/dom/stylesheetlist.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::codegen::Bindings::StyleSheetListBinding;
+use dom::bindings::codegen::Bindings::StyleSheetListBinding::StyleSheetListMethods;
+use dom::bindings::global::GlobalRef;
+use dom::bindings::js::{JS, Root};
+use dom::bindings::reflector::{Reflector, reflect_dom_object};
+use dom::document::Document;
+use dom::stylesheet::StyleSheet;
+use dom::window::Window;
+
+#[dom_struct]
+pub struct StyleSheetList {
+    reflector_: Reflector,
+    document: JS<Document>,
+}
+
+impl StyleSheetList {
+    #[allow(unrooted_must_root)]
+    fn new_inherited(doc: JS<Document>) -> StyleSheetList {
+        StyleSheetList {
+            reflector_: Reflector::new(),
+            document: doc
+        }
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(window: &Window, document: JS<Document>) -> Root<StyleSheetList> {
+        reflect_dom_object(box StyleSheetList::new_inherited(document),
+                           GlobalRef::Window(window), StyleSheetListBinding::Wrap)
+    }
+}
+
+impl StyleSheetListMethods for StyleSheetList {
+    // https://drafts.csswg.org/cssom/#dom-stylesheetlist-length
+    fn Length(&self) -> u32 {
+       self.document.stylesheets().len() as u32
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-stylesheetlist-item
+    fn Item(&self, index: u32) -> Option<Root<StyleSheet>> {
+        None
+        //TODO Create a new StyleSheet object and return it
+    }
+
+    // check-tidy: no specs after this line
+    fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<Root<StyleSheet>>{
+        let item = self.Item(index);
+        *found = item.is_some();
+        item
+    }
+}