DevTools: Add possibility to break on "wheel" event.
DevTools: Add possibility to break on "wheel" event.

BUG=347562
R=pfeldman
NOTRY=true

Review URL: https://codereview.chromium.org/178473018

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@168364 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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