(On behalf of yusukes) Handle Caps Lock short cut (Shift+Search) in ash [part 2 of 2].

Add caps_lock_handler.cc which implements ash::CapsLockDelegate.

Part 1 of 2: http://codereview.chromium.org/9242003
Original review for Part 2 of 2: http://codereview.chromium.org/9225004/ (LGTM'ed by ben@chromium.org and derat@chromium.org)

BUG=110129
TEST=ran browser_tests
TBR=ben@chromium.org,derat@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9297027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@119513 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed