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

This reverts commit c203e65265ccf0dcf426eafa4fae97b2b99cba7d.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Disable GL buffer mapping on TSAN/Mac.
> 
> Also reverts 65e706379657d64371012c2e95ccf1354d741145 which disabled buffer mapping in GrResourceProvider::createPatternedIndexBuffer.
> 
> Bug: skia:7058
> Change-Id: I6816abe53251e1cd8e92eae41b8cdbe45218a341
> Reviewed-on: https://skia-review.googlesource.com/50100
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

TBR=mtklein@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: Icf0cf40ba4d6e7081971eee2eea0a41033790df7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7058
Reviewed-on: https://skia-review.googlesource.com/57220
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/tests/TransferPixelsTest.cpp b/tests/TransferPixelsTest.cpp
index b59495f0f5..722707ae9b 100755
--- a/tests/TransferPixelsTest.cpp
+++ b/tests/TransferPixelsTest.cpp
@@ -64,10 +64,6 @@ bool does_full_buffer_contain_correct_values(GrColor* srcBuffer,
 
 void basic_transfer_test(skiatest::Reporter* reporter, GrContext* context, GrPixelConfig config,
                          GrSurfaceOrigin origin, bool renderTarget) {
-    if (GrCaps::kNone_MapFlags == context->caps()->mapBufferFlags()) {
-        return;
-    }
-
     // set up the data
     const int kTextureWidth = 16;
     const int kTextureHeight = 16;