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

This reverts commit c203e65265.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Disable GL buffer mapping on TSAN/Mac.
> 
> Also reverts 65e7063796 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>

infra/bots/recipes/test.py

@@ -195,8 +195,7 @@ def dm_flags(api, bot):
       configs = [x.replace(old, new) for x in configs]
       # We also test non-msaa instanced.
       configs.append(new)
-    elif 'MacMini7.1' in bot and 'TSAN' not in bot:
-      # The TSAN bot disables GL buffer mapping which is required for inst.
+    elif 'MacMini7.1' in bot:
       configs.extend([gl_prefix + 'inst'])
 
     # CommandBuffer bot *only* runs the command_buffer config.

src/gpu/GrResourceProvider.cpp

@@ -330,17 +330,13 @@ const GrBuffer* GrResourceProvider::createPatternedIndexBuffer(const uint16_t* p
     size_t bufferSize = patternSize * reps * sizeof(uint16_t);
 
     // This is typically used in GrMeshDrawOps, so we assume kNoPendingIO.
-    sk_sp<GrBuffer> buffer(this->createBuffer(bufferSize, kIndex_GrBufferType,
-                                              kStatic_GrAccessPattern, kNoPendingIO_Flag));
+    GrBuffer* buffer = this->createBuffer(bufferSize, kIndex_GrBufferType, kStatic_GrAccessPattern,
+                                          kNoPendingIO_Flag);
     if (!buffer) {
         return nullptr;
     }
-    uint16_t* data = (uint16_t*) buffer->map();
-    SkAutoTArray<uint16_t> temp;
-    if (!data) {
-        temp.reset(reps * patternSize);
-        data = temp.get();
-    }
+
+    SkAutoTArray<uint16_t> data(reps * patternSize);
     for (int i = 0; i < reps; ++i) {
         int baseIdx = i * patternSize;
         uint16_t baseVert = (uint16_t)(i * vertCount);
@@ -348,15 +344,14 @@ const GrBuffer* GrResourceProvider::createPatternedIndexBuffer(const uint16_t* p
             data[baseIdx+j] = baseVert + pattern[j];
         }
     }
-    if (temp.get()) {
-        if (!buffer->updateData(data, bufferSize)) {
-            return nullptr;
-        }
-    } else {
-        buffer->unmap();
+
+    if (!buffer->updateData(data.get(), bufferSize)) {
+        buffer->unref();
+        return nullptr;
     }
-    this->assignUniqueKeyToResource(key, buffer.get());
-    return buffer.release();
+
+    this->assignUniqueKeyToResource(key, buffer);
+    return buffer;
 }
 
 static constexpr int kMaxQuads = 1 << 12;  // max possible: (1 << 14) - 1;

src/gpu/gl/GrGLCaps.cpp

@@ -481,14 +481,6 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
         }
     }
 
-#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

src/gpu/instanced/GLInstancedRendering.cpp

@@ -37,8 +37,7 @@ GrCaps::InstancedSupport GLInstancedRendering::CheckSupport(const GrGLCaps& glCa
     // This method is only intended to be used for initializing fInstancedSupport in the caps.
     SkASSERT(GrCaps::InstancedSupport::kNone == glCaps.instancedSupport());
     if (!glCaps.vertexArrayObjectSupport() ||
-        (!glCaps.drawIndirectSupport() && !glCaps.drawInstancedSupport()) ||
-        GrGLCaps::kNone_MapBufferType == glCaps.mapBufferType()) {
+        (!glCaps.drawIndirectSupport() && !glCaps.drawInstancedSupport())) {
         return GrCaps::InstancedSupport::kNone;
     }
     return InstanceProcessor::CheckSupport(*glCaps.shaderCaps(), glCaps);

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;