Add [NewObject] and [SameObject] to various interfaces

Source/core/frame/Window.idl

Index: Source/core/frame/Window.idl
diff --git a/Source/core/frame/Window.idl b/Source/core/frame/Window.idl
index 006a11d949f4e4de69420216929c0824e4dc64cf..426a07c9c4f8767b01c970f040b9f3721ee610c7 100644
--- a/Source/core/frame/Window.idl
+++ b/Source/core/frame/Window.idl
@@ -95,7 +95,7 @@
     // CSS Object Model (CSSOM)
     // http://dev.w3.org/csswg/cssom/#extensions-to-the-window-interface
     // FIXME: The optional pseudoElt argument should have no default.
-    [TypeChecking=Interface] CSSStyleDeclaration getComputedStyle(Element elt, optional DOMString? pseudoElt = null);
+    [NewObject, TypeChecking=Interface] CSSStyleDeclaration getComputedStyle(Element elt, optional DOMString? pseudoElt = null);
     // http://dev.w3.org/csswg/cssom/#utility-apis
     // FIXME: CSS should be an interface with static members, in which
     // case this getter would not be needed.
@@ -103,8 +103,8 @@
 
     // CSSOM View Module
     // http://dev.w3.org/csswg/cssom-view/#extensions-to-the-window-interface
-    MediaQueryList matchMedia(DOMString query);
-    readonly attribute Screen screen;
+    [NewObject] MediaQueryList matchMedia(DOMString query);
+    [SameObject] readonly attribute Screen screen;
 
     // browsing context
     // FIXME: The x and y arguments should not be optional. crbug.com/453421