Don't bother doing the empty clip check in SkRecordDraw.

Don't bother doing the empty clip check in SkRecordDraw.

On Mike's suggestion, I tested out not doing any empty-clip check at all in
SkRecordDraw, given that mostly we'll do that again anyway inside SkCanvas.

Most SKPs are identical to the status quo, whether bot or silk, played back in tiles 
or full.  Average playback performance, both arithmetic and geometric mean, is also 
unchanged.

A handful of SKPs do draw faster or slower reliably, particularly when tiled.  E.g. a 
cnn tile draws about 40% faster, a cuteoverload tile about 20% slower.  Their profiles 
look pretty much the same before and after, so I can't really explain the changes.

I'd say, given that performance is mostly identical and very identical in bulk,
we might as well remove this code.  It's nice to keep SkRecordDraw as dumb as possible.

BUG=skia:2378
Committed: http://code.google.com/p/skia/source/detail?r=14433

[reed1, 2014-04-29 12:29:57]

lgtm

[f(malita), 2014-04-29 12:42:09]

lgtm

[mtklein, 2014-04-29 13:01:40]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-04-29 13:01:46]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/258183002/20001

[mtklein, 2014-04-29 13:52:01]

The CQ bit was unchecked by mtklein@google.com

[mtklein, 2014-04-29 13:52:09]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-04-29 13:52:26]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/258183002/20001

[borenet, 2014-04-29 15:27:07]

The CQ bit was unchecked by borenet@google.com

[borenet, 2014-04-29 15:27:13]

The CQ bit was checked by borenet@google.com

[commit-bot: I haz the power, 2014-04-29 15:27:24]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/258183002/20001

[commit-bot: I haz the power, 2014-04-29 15:34:08]

Change committed as 14433