Adds support for showing the match preview on views. It's behind the
flag --enable-match-preview. There is still a lot of details to get it
working good enough, but this is a good point to check some stuff in.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3105004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55665 0039d316-1c4b-4281-b951-d872f2087c98
17 files changed