DevTools: [FlameChart] draw bars even if their width less than 1px.
DevTools: [FlameChart] draw bars even if their width less than 1px.

For a better UI we round bar width up to 2px.

BUG=251265
TEST=none
R=yurys@chromium.org

Review URL: https://codereview.chromium.org/17378006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152649 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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