Add SK_API to GrBackendTexture and GrBackendRenderTarget

Change-Id: Ibae248bf8e2d2da860e99b62346e737da55a85b5
Reviewed-on: https://skia-review.googlesource.com/21827
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed