Store filterbitmap on Paint

Update Paint and SkiaCanvas now that SkFilterQuality is no longer
part of Skia's API.

1. Store mFilterBitmap:bool directly in Paint (matching java side)

2. Change Looper construct to operate on Paint rather than SkPaint
... so it can access mFilterBitmap.

3. Update PaintFilter to take Paint instead of SkPaint

As before, when we do have to call SkCanvas, we convert Paint's
mFilterBitmap into SkSamplingOptions as needed.

Test: make

Bug: 178700363
Change-Id: I7fccf17657d4e255f2453b4bfc513215503597b2