Fix flippity GM for *ooprddl configs

The flippity GM doesn't create backend textures but it does perform some custom proxy creation (i.e., using MakeTextureProxyFromData to set the origin) that requires a direct context. This work must be done in onGpuSetup but doesn't entail any fancy lifetime management.

Change-Id: Ica4f4f7476778cdf934c3be9ef8c9a28d0d4ba2e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/297445
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed