Issue trace events to gather repaint information.

This CL adds a few trace events in to gather information about the cause
and size of repaints.

BUG=320139, 351498

Review URL: https://codereview.chromium.org/208143003

git-svn-id: svn://svn.chromium.org/blink/trunk@170486 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unnecessary include at RenderTableSection after bug fixed

Review URL: https://codereview.chromium.org/219023006

git-svn-id: svn://svn.chromium.org/blink/trunk@170487 bbb929c8-8fbe-4397-9dbb-9b2b20218538