Frameworks changes to support latest Skia (r14729)

Required for a merge in external/skia
(I88b4d5cc81c357a8e223bd7860b1029590265200).

Includes two cherry-picks:

I456df543e1925b280f785c7b3bb81370157f9b09:
replace SkRasterizer* with NativeRasterizer* in JNI

I98adb200e023369d3ee75f21927fa98f23095a77:
Fix Paint.getFlags,setFlags wrt FILTER_BITMAP_FLAG

In Paint.setFlags(), turn FILTER_BITMAP_FLAG into a call to
SkPaint::setFilterLevel().

In Paint.getFlags(), read SkPaint::getFilterLevel() to determine
whether to include FILTER_BITMAP_FLAG in the result.

Fixes CTS tests with ToT Skia.

Change-Id: I2736f3f68683651574d79a169ff0ab563e0a469e