Whitelist intentionally racy TRACE_EVENT reads and writes.

src/core/SkTraceEvent.h

Index: src/core/SkTraceEvent.h
diff --git a/src/core/SkTraceEvent.h b/src/core/SkTraceEvent.h
index 34e3adf0eda329b0be187c4b43025d9d940355ce..2c3c9b41819be2851a4608b9b08d4e9bb42a9ee4 100644
--- a/src/core/SkTraceEvent.h
+++ b/src/core/SkTraceEvent.h
@@ -162,6 +162,7 @@
 #define SkTraceEvent_DEFINED
 
 #include "SkEventTracer.h"
+#include "SkDynamicAnnotations.h"
 
 // By default, const char* argument values are assumed to have long-lived scope
 // and will not be copied. Use this macro to force a const char* to be copied.
@@ -764,10 +765,12 @@
 // write here because it's not strictly needed for correctness.
 // So says Nat.
 // FIXME
+//
+// Skia addition: we mark these as unprotected reads and writes to shut up TSAN.
 
 #define TRACE_EVENT_API_ATOMIC_WORD intptr_t
-#define TRACE_EVENT_API_ATOMIC_LOAD(var) (*(&var))
-#define TRACE_EVENT_API_ATOMIC_STORE(var, value) (var=value)
+#define TRACE_EVENT_API_ATOMIC_LOAD(var) SK_ANNOTATE_UNPROTECTED_READ(var)
+#define TRACE_EVENT_API_ATOMIC_STORE(var, value) SK_ANNOTATE_UNPROTECTED_WRITE(&var, value)
 
 // Defines visibility for classes in trace_event.h
 #define TRACE_EVENT_API_CLASS_EXPORT SK_API