Change LayerSquashing to status=stable.

TBR=vollick@chromium.org

Review URL: https://codereview.chromium.org/313023002

git-svn-id: svn://svn.chromium.org/blink/trunk@175490 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: make Id the first parameter of protocol message.

It helps to troubleshoot messages traffic between DevTools and the inspected page.

BUG=

Review URL: https://codereview.chromium.org/316813003

git-svn-id: svn://svn.chromium.org/blink/trunk@175491 bbb929c8-8fbe-4397-9dbb-9b2b20218538