Fix for performance regression due to r3832

r3832 caused the GrInOrderDrawBuffer to push state too often. This patch moves the new behavior modifying flag to its own field so it won't "change" the draw state.

[robertphillips, 2012-05-04 16:26:27]

This patch reduces picture_playback* from ~998 msecs to ~738 msecs.

[TomH, 2012-05-04 16:29:23]

LGTM.

(Although those performance numbers are both worse than what I was seeing; the
magnitude of improvement is approximately right, though, so we'll see how it
bears out on the bots & in chromium.)

[robertphillips, 2012-05-04 16:35:29]

committed as r3840

[robertphillips, 2012-05-04 16:39:18]

I suspect you were running NULLGPU for which I get:
   old: ~697 new: ~527
The numbers I reported earlier were for GPU.