When cache is full delay flush until GrContext draw is finished

When cache is full delay flush until GrContext draw is finished

Committed: http://code.google.com/p/skia/source/detail?r=11613

[bsalomon, 2013-10-04 15:14:33]

Prior to this CL

gm --gpuCacheSize 0 0 --config gpu

reproduced the crash we're seeing in Chrome. After this CL it does not
reproduce.

Maybe we really should be drawing direct (skipping IODB) when the budget is
really small but I'll leave that decision for another day.

I'll also file a bug to run GM in this manner on at least one bot. I'm thinking
a Debug build.

[robertphillips, 2013-10-04 15:28:12]

lgtm + comment suggestion & question

https://codereview.chromium.org/25673004/diff/1/include/gpu/GrContext.h
File include/gpu/GrContext.h (right):

https://codereview.chromium.org/25673004/diff/1/include/gpu/GrContext.h#newco...
include/gpu/GrContext.h:879: 
// This is a marker that the various draw calls can set to indicate that a flush
is required

https://codereview.chromium.org/25673004/diff/1/src/gpu/GrContext.cpp
File src/gpu/GrContext.cpp (right):

https://codereview.chromium.org/25673004/diff/1/src/gpu/GrContext.cpp#newcode72
src/gpu/GrContext.cpp:72: public:
What do you think about requiring the context in the ctor and removing the set
method?

[commit-bot: I haz the power, 2013-10-04 16:13:42]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/bsalomon@google.com/25673004/4001

[commit-bot: I haz the power, 2013-10-04 16:24:02]

Change committed as 11613