DevTools: FlameChart. convert the manual paint Entry Info on a canvas into html table

In this case we would be able to draw the main canvas partially.
Othervise the entry info part will become less and less transparent after each repaint
and we will see artefacts from previous paints.

BUG=none
R=alph@chromium.org

Review URL: https://codereview.chromium.org/25683003

git-svn-id: svn://svn.chromium.org/blink/trunk@158718 bbb929c8-8fbe-4397-9dbb-9b2b20218538