Give GrDrawTarget a back ptr to its owning GrContext.

Give GrDrawTarget a back ptr to its owning GrContext.
Committed: https://code.google.com/p/skia/source/detail?r=7850

[bsalomon, 2013-02-25 14:00:33]

I'm going to want to make GrDrawTarget use the cache to get a texture when a
copy of the dst must be made before a draw. The context will be used to access
the cache.

[robertphillips, 2013-02-25 14:12:52]

lgtm except for the succeeded bit which I can live with but I'm hoping there is
a cleaner way.

https://codereview.appspot.com/7395055/diff/1/include/gpu/GrContext.h
File include/gpu/GrContext.h (right):

https://codereview.appspot.com/7395055/diff/1/include/gpu/GrContext.h#newcode877
include/gpu/GrContext.h:877: GrContext(GrBackend, GrBackendContext);
'succeeded' seems a bit suspect. Should we be initializing as a separate step?

https://codereview.appspot.com/7395055/diff/1/src/gpu/GrDrawTarget.h
File src/gpu/GrDrawTarget.h (right):

https://codereview.appspot.com/7395055/diff/1/src/gpu/GrDrawTarget.h#newcode90
src/gpu/GrDrawTarget.h:90: 
should _not_

[bsalomon, 2013-02-25 14:53:31]

Good suggestion. I added an init() to GrContext in the updated patch.

https://codereview.appspot.com/7395055/diff/1/src/gpu/GrDrawTarget.h
File src/gpu/GrDrawTarget.h (right):

https://codereview.appspot.com/7395055/diff/1/src/gpu/GrDrawTarget.h#newcode90
src/gpu/GrDrawTarget.h:90: 
On 2013/02/25 14:12:52, robertphillips wrote:
> should _not_

Done.

[robertphillips, 2013-02-25 16:36:06]

lgtm - I like that better