Integration tests for window.orientation.

This is making the web content believe the orientation has
changes in order to test the entire stack between the Chrome
Android implementation and the web content behaviour.

BUG=None

Review URL: https://codereview.chromium.org/189193004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256236 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256236