expose api to count the number of ops in a picture

expose api to count the number of ops in a picture

BUG=skia:

[mtklein, 2014-08-14 19:09:53]

lgtm.  I believe this is trivial O(1) for both backends.

[reed1, 2014-08-14 19:32:07]

Can we return this from the current backend as is, or do we need to modify
recording to actually accumulate this number?

[mtklein, 2014-08-14 19:43:29]

On 2014/08/14 19:32:07, reed1 wrote:
> Can we return this from the current backend as is, or do we need to modify
> recording to actually accumulate this number?

Well, as things sit right now, once recorded we can get an op count like this:
  Old: SkPicture->SkPictureData->SkPictureContentInfo->numOperations();
  New: SkPicture->SkRecord->count();
Shouldn't be any recording changes needed.

This might be simpler as just a method on SkPicture, actually, rather than
SkPictureUtils.h.

[mtklein, 2014-08-14 19:56:16]

On 2014/08/14 19:43:29, mtklein wrote:
> On 2014/08/14 19:32:07, reed1 wrote:
> > Can we return this from the current backend as is, or do we need to modify
> > recording to actually accumulate this number?
> 
> Well, as things sit right now, once recorded we can get an op count like this:
>   Old: SkPicture->SkPictureData->SkPictureContentInfo->numOperations();
>   New: SkPicture->SkRecord->count();
> Shouldn't be any recording changes needed.
> 
> This might be simpler as just a method on SkPicture, actually, rather than
> SkPictureUtils.h.

This is what I'm thinking: https://codereview.chromium.org/470333002/

[reed1, 2014-08-14 20:05:54]

closing in favor of https://codereview.chromium.org/470333002/