Move paints to the front of draw structs.

Move paints to the front of draw structs.

The order of arguments in these structs is arbitrary, so we might as well arrange them to optimize something.  Putting the paints at the front means the logic to find the paint is a lot more concise: it's usually just ptr+0, or *(ptr+0) when the SkPaint is optional.

This considerably reduces the size of the jump table in IsDraw::operator().

BUG=skia:2378
Committed: http://code.google.com/p/skia/source/detail?r=14634

[f(malita), 2014-05-07 22:51:33]

lgtm

[mtklein, 2014-05-07 22:53:00]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-05-07 22:53:44]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/272673002/30001

[commit-bot: I haz the power, 2014-05-07 22:59:41]

Change committed as 14634