Moved logic from AccountCreationView to AccountScreen.
Added RoundedRectBorder to use instead of background for DOMView.
Refactored rounded_rect_painter.h/cc to share code and encapsulate most of
constants.
Modified Gaia page by injecting CSS and JS so it looks better for Chrome OS.

BUG=35157,37069,37070.
TEST=Launch with --login-screen=account. Customized Gaia account creation
page should appear.

Review URL: http://codereview.chromium.org/661398

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@40627 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed