First round of GPU gradient rebaseline

First round of GPU gradient rebaseline

Committed: https://code.google.com/p/skia/source/detail?r=11161

[bsalomon, 2013-09-09 16:26:59]

Committed patchset #1 manually as r11161 (presubmit successful).

[epoger, 2013-09-09 16:28:18]

LGTM

Just out of curiosity, why the "rounds" of rebaselining?  Is there something in
the process that can only support a certain number of tests at a time?

[bsalomon, 2013-09-09 16:31:55]

On 2013/09/09 16:28:18, epoger wrote:
> LGTM
> 
> Just out of curiosity, why the "rounds" of rebaselining?  Is there something
in
> the process that can only support a certain number of tests at a time?

I wanted to get images checked in for the bots that have already finished. If
they turn green then it'll make me feel better that I haven't broken anything
even though there's a longer tail of bots to finish taking care of. Also, if
most of the bots go green before all are finished I'd take the tree off of
yellow to unblock the commit queue.

[epoger, 2013-09-09 16:32:41]

On 2013/09/09 16:31:55, bsalomon wrote:
> On 2013/09/09 16:28:18, epoger wrote:
> > LGTM
> > 
> > Just out of curiosity, why the "rounds" of rebaselining?  Is there something
> in
> > the process that can only support a certain number of tests at a time?
> 
> I wanted to get images checked in for the bots that have already finished. If
> they turn green then it'll make me feel better that I haven't broken anything
> even though there's a longer tail of bots to finish taking care of. Also, if
> most of the bots go green before all are finished I'd take the tree off of
> yellow to unblock the commit queue.

Gotcha, it's because some of the bots take so long.  Makes sense.

[bsalomon, 2013-09-09 16:36:01]

On 2013/09/09 16:31:55, bsalomon wrote:
> On 2013/09/09 16:28:18, epoger wrote:
> > LGTM
> > 
> > Just out of curiosity, why the "rounds" of rebaselining?  Is there something
> in
> > the process that can only support a certain number of tests at a time?
> 
> I wanted to get images checked in for the bots that have already finished. If
> they turn green then it'll make me feel better that I haven't broken anything
> even though there's a longer tail of bots to finish taking care of. Also, if
> most of the bots go green before all are finished I'd take the tree off of
> yellow to unblock the commit queue.

One other thing: this change touches a lot of tests, so the rebaseline is a bit
harder than normal. I don't want to get confused by any other unrelated
lingering image mismatches or flakes. So I picked a bot that was green and went
red on my change. I grabbed it's set of image mismatches and used that with the
--tests param to try to isolate my rebaselining. I'm not 100% sure that the set
is complete. So if I get an early round in I can see if it is the correct set
for some other bots and update it if not.