Added ability to flatten drawPicture's to debugger

Skps can have embedded SkPictures within them - which are opaque to the debugger. This CL allows the debugger to write out a flattened SkPicture to give visibility into the sub-SkPictures (when the new .skp is loaded).

[DerekS, 2013-02-21 20:42:01]

looks like we will probably implement this another way, but if you really feel like this functionality is important in the short term we can discuss putting it in until an alternative is developed. https://codereview.appspot.com/7381044/diff/1/debugger/SkDrawCommand.h File debugger/SkDrawCommand.h (right): https://codereview.appspot.com/7381044/diff/1/debugger/SkDrawCommand.h#newcode17 debugger/SkDrawCommand.h:17: enum SkExecuteBits { since it is already scoped inside SkDrawCommand you can mimic the behavior of other enums like this in Skia and drop the Sk. I would also use flags instead of bits to consistent as well. enum ExecuteFlags { https://codereview.appspot.com/7381044/diff/1/debugger/SkDrawCommand.h#newcode41 debugger/SkDrawCommand.h:41: virtual void execute(SkCanvas* canvas, int flags)=0; I think it is better to have the signature include the enum name instead of just int. ...canvas, ExecuteFlags flags)=0;

[robertphillips, 2013-02-22 16:26:18]

Lets consider this CL parked. If anyone starts screaming for this capability we can revisit it.