Redesign of the chrome://flags page

+ Improve responsive design for mobile devices. Larger touch targets.
+ Simplified the warning blurb.
+ Add in page flag search for better filtering, significantly better
search experience on mobile devices.
+ Add tab interface separating Available and Unavailable flags.
+ Uses updated modern colour scheme and typography.
+ Display Chrome version number on the page.

Bug: 622640
Change-Id: I55f1739ab12c4d28c7ace0f234fabb30577abf21
Reviewed-on: https://chromium-review.googlesource.com/693256
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Edward Jung <edwardjung@chromium.org>
Cr-Commit-Position: refs/heads/master@{#507085}
8 files changed