Store color and coverage stages in a single array in GrOptDrawState.

BUG=skia:

Review URL: https://codereview.chromium.org/641223002
Revert of Use BBH reserve hook to preallocate space for tiles. (patchset #2 id:80001 of https://codereview.chromium.org/639823005/)

Reason for revert:
failed assertion "fXTiles * fYTiles != 0"

Original issue's description:
> Use BBH reserve hook to preallocate space for tiles.
>
> Before getting too far into changing how SkTileGrid stores its tiles, I figured I'd
> better see how much I can tweak out the existing format.  Cleverly, that way
> any improvements I make by changing the format will look that much less
> impressive.
>
> This CL looks like it will be a 5-15% win in time spent recording, with no effect
> on playback.
>
> This CL also shrinks the tiles to fit exactly when we're done inserting,
> using newly added SkTDArray::shrinkToFit().  It's quite cheap to run (maybe
> taking back 1-2% from those 5-15% wins), and means we'll lug around about 15%
> fewer bytes in the tile grids.  Note though this strategy temporarily uses up to
> 30% more memory while building the tile grid.  For our largest SKPs, that's
> maybe 75-100K extra.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/52455cbc02d7f480d988ae7cdacc11ad69078c2c

TBR=reed@google.com,robertphillips@google.com,mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/642933002
cleanup and optimize rect intersect routines

BUG=skia:

Review URL: https://codereview.chromium.org/640723004
FPs now use the correct builder types(just a rename)

BUG=skia:

Review URL: https://codereview.chromium.org/648463003