Batch everything

This is dependent upon http://codereview.appspot.com/6460095/ landing first.

[bsalomon, 2012-08-16 15:47:35]

Batch all GrContext draws into IODB. Two motivations:

1) Watch perf bots, see what happens.

2) This may help with a perf regression Riley saw when enabling the gradient
atlast. This will allow the texsubimage operations to slip past the draws that
use the texture in the GL stream. (Riley passes the kDontFlush flag to
writeTexturePixels since he explicitly tracks the data hazards.)

[bsalomon, 2012-08-16 15:54:44]

I should also add that this caused a couple images to change by an LSB. Stop by
my desk if you'd like to see the skdiff.

[TomH, 2012-08-16 15:57:31]

LGTM.

Do you have perf #s from your desktop?

[reed1, 2012-08-16 16:02:18]

http://codereview.appspot.com/6462069/diff/7001/src/gpu/GrContext.cpp
File src/gpu/GrContext.cpp (right):

http://codereview.appspot.com/6462069/diff/7001/src/gpu/GrContext.cpp#newcode35
src/gpu/GrContext.cpp:35: // debugging easier.
Export this "default" to the outside world, so it can be toggled on/off using
.gyp or SkUserConfig.h? In that way chrome can try it on/off w/o necessitating a
DEPS roll each time...

[bsalomon, 2012-08-16 16:21:32]

Generating local Linux bench runs now...

http://codereview.appspot.com/6462069/diff/7001/src/gpu/GrContext.cpp
File src/gpu/GrContext.cpp (right):

http://codereview.appspot.com/6462069/diff/7001/src/gpu/GrContext.cpp#newcode35
src/gpu/GrContext.cpp:35: // debugging easier.
On 2012/08/16 16:02:18, reed1 wrote:
> Export this "default" to the outside world, so it can be toggled on/off using
> .gyp or SkUserConfig.h? In that way chrome can try it on/off w/o necessitating
a
> DEPS roll each time...

Good idea, will update.

[robertphillips, 2012-08-16 18:16:20]

lgtm

[bsalomon, 2012-08-16 18:38:36]

Committed as r5136.

I uploaded another patchset that includes the output of bench_compare.py on my
linux box. Some of the numbers are to be believed and others are not. The hope
is cpu time goes up a little bit but gpu time goes down more.