HACK: Use www.intel.com as start up URL

So we know that Xwalk is loading.
Add supplement file for ChromeOS builds

Doing this way, now to update the project can be done via gyp_chromium script:
  ./build/gyp_chromium -Dchromeos=1
runtime/browser: Fix Xwalk to actually run on Ash

It's launched by Ash shell via window launcher UI. Con: Xwalk solely on
ChromeOS got broken (but who cares!).