Move mip map regen from GrGLProgram to GrGLGpu

Change-Id: I056d5af13aeb5c2d481286ccb06947d4ef3b948f
Reviewed-on: https://skia-review.googlesource.com/145141
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
4 files changed