Detect RenderDoc in Windows viewer and make a core profile

BUG=skia:

Change-Id: I03a8a1b1ed9bd2483ddd8e231ba54dc10753b454
Reviewed-on: https://skia-review.googlesource.com/9836
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed