Revert "Revert "Disable GL buffer mapping on TSAN/Mac.""

This reverts commit 4e7cdd5a0052aa76bed6f80ec325be19e09e6ab1.

Bug: skia:7058
Change-Id: I3b92c35835cf7a8c04e9218194bf293b790413e0
Reviewed-on: https://skia-review.googlesource.com/57222
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index af04dc7..94c5f2e 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -481,6 +481,14 @@
         }
     }
 
+#if defined(__has_feature)
+#if defined(SK_BUILD_FOR_MAC) && __has_feature(thread_sanitizer)
+    // See skbug.com/7058
+    fMapBufferType = kNone_MapBufferType;
+    fMapBufferFlags = kNone_MapFlags;
+#endif
+#endif
+
     // We found that the Galaxy J5 with an Adreno 306 running 6.0.1 has a bug where
     // GL_INVALID_OPERATION thrown by glDrawArrays when using a buffer that was mapped. The same bug
     // did not reproduce on a Nexus7 2013 with a 320 running Android M with driver 127.0. It's