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 <[email protected]>
Reviewed-by: Colin Blundell <[email protected]>
Reviewed-by: Bernhard Bauer <[email protected]>
Reviewed-by: Eugene But <[email protected]>
Commit-Queue: Edward Jung <[email protected]>
Cr-Commit-Position: refs/heads/master@{#507085}
8 files changed