imaging: add support for scene pictures and images#42
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This adds Arc backed handles for pictures and images which more or less map to SkPicture and SkImage where the intent of the picture is for the backend to retain an accelerated structure of some sort for the scene and the intent of the image is for the backend to retain a rasterized image of the scene (although the backend may choose the method of implementation). The backends are expected to keep weak references to the handles and may clear the associated data when there are no more strong references.