Rewrite GrTextureMaker to disentangle bitmap case from base class and give GPU object a say in what copying needs to be done.

Committed: https://skia.googlesource.com/skia/+/fcffaf22d697f06f903c3193308f9dc54a959f79

Committed: https://skia.googlesource.com/skia/+/1a197ea31e0aac7ea312e9a6c0d9f5df626b0350

Review URL: https://codereview.chromium.org/1409163002
14 files changed