Use SkPaint::getFontBounds() for text bounding boxes in pictures.

Now that SkTextBlobs have landed, this is a perf no-op, but it at least lets us eliminate a bunch of questionable hacks.

CQ_EXTRA_TRYBOTS=client.skia:Test-Win7-ShuttleA-HD2000-x86-Debug-Trybot,Test-Mac10.8-MacMini4.1-GeForce320M-x86_64-Debug-Trybot

BUG=skia:

Review URL: https://codereview.chromium.org/805983003
2 files changed