Convert BBH APIs to use SkRect.

Still TODO: convert internals of SkTileGrid.cpp and SkRTree.cpp to work in floats too.

NOTREECHECKS=true

BUG=skia:1021
R=robertphillips@google.com, reed@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/511613002
20 files changed