hide getTotalClip, so we can eventually remove it

hide getTotalClip, so we can eventually remove it 
hide getClipType, so we can eventually remove it

patch from issue 189443007

TBR=robertphilips@google.com

Committed: http://code.google.com/p/skia/source/detail?r=13715

[reed2, 2014-03-08 03:42:19]

The CQ bit was checked by reed@chromium.org

[commit-bot: I haz the power, 2014-03-08 03:42:26]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/reed@chromium.org/189883010/1

[reed2, 2014-03-08 03:44:45]

change from first CL -- fixed SkNullCanvas.h in experimental

[commit-bot: I haz the power, 2014-03-08 03:57:23]

Change committed as 13715

[reed2, 2014-03-08 12:23:40]

I think this Cl is incomplete.

It seems that there is a suite of APIs around the state of the current clip:
- isClipEmpty
- isClipRect
- getClipDeviceBounds (returns false on empty)
- getClipLocalBounds (returns false on empty)
[- getClipType]
[- getTotalClip]

It seems like there need only be 1 or maybe 2 virtuals here, and that the other
can be non-virtual helpers. 
My goals for a future CL would be:
- reduce # of virtuals to make subclassing easier/clearer
- organize the methods themselves to make it clearer to a Client how they relate
to each other