Add chrome://nfc-debug for debugging NFC on Chrome OS.

Wrote a simple WebUI page that demonstrates the functionality of the NFC API
defined in device/nfc. This is primarily meant for testing and demo purposes.

BUG=336687

Review URL: https://codereview.chromium.org/131103007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247118 0039d316-1c4b-4281-b951-d872f2087c98
Blink roll 165808:165810

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=165809:165810&mode=html
TBR=
BUG=

Review URL: https://codereview.chromium.org/132853005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247119 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247118
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247120 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247120