Don't check for framebuffer completeness on TSAN builds.
Don't check for framebuffer completeness on TSAN builds.

It causes the OOPR DDL TSAN Quadro P400 bot to fail readbacks
(even though glCheckFramebufferStatus reports GL_FRAMEBUFFER_COMPLETE).

Bug: skia:12644

Change-Id: Ie68251ac36285b8c3e13431504b95cd09fa22ea3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/470956
Auto-Submit: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>
Commit-Queue: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>
Reviewed-by: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>

google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia