Disable ReadPixels_Texture & ReadPixels_Gpu on ANGLE

Depends on https://skia-review.googlesource.com/c/19101/ (Store context type (rather than backend type) in ContextInfo)

Bug: skia:6742
Change-Id: I321c01838acf93ad28a17d8e97aa1bf594425502
Reviewed-on: https://skia-review.googlesource.com/19077
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed