DevTools: Calculate number of warnings and errors and listen for pause in all targets

BUG=

Review URL: https://codereview.chromium.org/388793002

git-svn-id: svn://svn.chromium.org/blink/trunk@178041 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Gardening: update some TestExpectations

BUG=393521,393523,243249,381373
TBR=junov

Review URL: https://codereview.chromium.org/384003004

git-svn-id: svn://svn.chromium.org/blink/trunk@178042 bbb929c8-8fbe-4397-9dbb-9b2b20218538