Blink-side layout tests for the new Device Orientation API.

Implement the Blink-side testing framework for the new
Device Orientation API, using Platform instead of the old
'client' approach.
In particular this patch:
- Adds checks for the 'absolute' field.
- Modifies Layout tests where necessary to ensure they are
working correctly.
- Switches to the NewDeviceOrientationController
in DOMWindow.

BUG=261165

Review URL: https://chromiumcodereview.appspot.com/22599005

git-svn-id: svn://svn.chromium.org/blink/trunk@158028 bbb929c8-8fbe-4397-9dbb-9b2b20218538