Fix two leaks & improve leak tracking

The two leaks are:
  missing unrefs in megalooper GM
  missing reset capability in oval renderer

This CL also expands the instance counting system to some recently adding classes (e.g., SkFontStyleSet)

Committed: http://code.google.com/p/skia/source/detail?r=10030

[bsalomon, 2013-07-11 19:35:03]

On 2013/07/11 19:22:18, robertphillips wrote:

lgtm

[commit-bot: I haz the power, 2013-07-11 22:22:07]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/robertphillips@google.com/18461007/1

[commit-bot: I haz the power, 2013-07-11 22:29:39]

Change committed as 10030