Rebaselining CSS3DBlueBox gpu pixel test for the bots.

R=kbr@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/25812004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226683 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226683
Add option to enable component extensions with background pages.

This is necessary for autotests that rely on such component extensions, such as quickoffice.

BUG=266438
TEST=manual

Review URL: https://codereview.chromium.org/24985002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226684 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226684