[WebProfilerBundle] Draw retina canvas if devicePixelRatio is bigger than 1
merged branch henrikbjorn/time-collector-canvas (PR #7065)

This PR was merged into the master branch.

Commits
-------

439b8bc [WebProfilerBundle] Draw retina canvas if devicePixelRatio is bigger than 1

Discussion
----------

[2.3] [WebProfilerBundle] Draw retina canvas elements

When using a MacBook Pro Retina the default canvas is fuzzy and ugly, this scales the elements for a higher DPI so they will look sharp and crisp.