re-land 5578 w/ pipe fix



git-svn-id: http://skia.googlecode.com/svn/trunk/src@5580 2bbb7eff-a529-9590-31e7-b0007b416f81

• core/SkBBoxRecord.cpp[diff]
• core/SkBBoxRecord.h[diff]
• core/SkCanvas.cpp[diff]
• core/SkPicture.cpp[diff]
• core/SkPictureFlat.h[diff]
• core/SkPicturePlayback.cpp[diff]
• core/SkPictureRecord.cpp[diff]
• core/SkPictureRecord.h[diff]
• pipe/SkGPipePriv.h[diff]
• pipe/SkGPipeRead.cpp[diff]
• pipe/SkGPipeWrite.cpp[diff]
• utils/SkDeferredCanvas.cpp[diff]
• utils/SkDumpCanvas.cpp[diff]
• utils/SkNWayCanvas.cpp[diff]
• utils/SkProxyCanvas.cpp[diff]