Adding forwards / backwards cycling hotkey through logged in users

This does not add the keys to the keyboard overlay page. I am investigating that in parallel (note that these keys are only in an experiment behind (several) flags and as such this might not even be required for now).

BUG=321629
TEST=unittest (additionally tested visually)

Review URL: https://codereview.chromium.org/104403003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238774 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238774
Relax OWNERS for ash.gyp

It's common to add a file, which shouldn't need another OWNERS stamp.

BUG=None
TEST=None
R=oshima@chromium.org

Review URL: https://codereview.chromium.org/105043003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238775 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238775
Android: refactors printing code & adds a test

Review URL: https://codereview.chromium.org/85693005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238776 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238776