DevTools: [CodeMirror] Update the CSS mode

Pull the upstream CSS mode to improve css/scss tokenization.

R=vsevik@chromium.org

Review URL: https://codereview.chromium.org/18314004

git-svn-id: svn://svn.chromium.org/blink/trunk@153339 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Insert sampling tracing macros to DOM attribute setters

- Just in case, this CL doesn't insert macros to DOM attribute setters with [PerWorldBindings].

- Even if I insert macros to DOM attribute setters with [PerWorldBindings],
I confirmed that there is no performance regression in Bindings/id-setter.html.

BUG=241743
R=abarth

Review URL: https://chromiumcodereview.appspot.com/18202002

git-svn-id: svn://svn.chromium.org/blink/trunk@153340 bbb929c8-8fbe-4397-9dbb-9b2b20218538