[evita] dom: Rename |domapi::ViewEventHandler::DidResizeWidget()| to |DidChangeWindowBounds()|.
[evita] dom: Tidying up "evita/dom/windows/window.js" and "evita/dom/windows/Window.idl".
[evita] domapi: Introduce |domapi::ViewEventHandler::DidChangeWindowVisibility(WindowId, Visibility)| for tracking window visibility in JavaScript.
[evita] dom: Introduce |Window.prototype.visible| property for tracking window visibility from JavaScript.
[evita] views: Integrate |domapi::ViewEventHandler::DidChangeWindowVisibility(WindowId, Visibility)| to view world.
[evita] dom: Fix call sites of |Window.handleEvent(event)| to pass |this| argument.
[evita] dom/windows: Make |WindowTest.visible| test case to do right thing.
[evita] dom/testing: Use strict equal operator === for checking equality.
[evita] dom/commans: Make |Ctrl+Shift+1| close visible sibling windows.
This patch fixes #5.