getDeferredTextureImageData(): preserve color space in legacy mode

Bug: skia:
Change-Id: Ib205f6104827b734635df6932d6dcfdc2248d091
Reviewed-on: https://skia-review.googlesource.com/12103
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
3 files changed