Move timeline and trace viewer events for text autosizing.

We no longer create these events when the text autosizer's maximum
multiplier check causes an early exit from processSubtree.

BUG=

Review URL: https://codereview.chromium.org/195273003

git-svn-id: svn://svn.chromium.org/blink/trunk@169189 bbb929c8-8fbe-4397-9dbb-9b2b20218538