Whitelist intentionally racy TRACE_EVENT reads and writes.

include/core/SkDynamicAnnotations.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDynamicAnnotations_DEFINED
 #define SkDynamicAnnotations_DEFINED
 
@@ skipping 24 matching lines @@
 template <typename T>
 inline T SK_ANNOTATE_UNPROTECTED_READ(const volatile T& x) {
     AnnotateIgnoreReadsBegin(__FILE__, __LINE__);
     T read = x;
     AnnotateIgnoreReadsEnd(__FILE__, __LINE__);
     return read;
 }
 
 // Like SK_ANNOTATE_UNPROTECTED_READ, but for writes.
 template <typename T>
-inline void SK_ANNOTATE_UNPROTECTED_WRITE(T* ptr, const volatile T& val) {
+inline void SK_ANNOTATE_UNPROTECTED_WRITE(T* ptr, const T& val) {
     AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
     *ptr = val;
     AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
 }
 
 // Ignore racy reads and racy writes to this pointer, indefinitely.
 // If at all possible, use the more precise SK_ANNOTATE_UNPROTECTED_READ.
 template <typename T>
 void SK_ANNOTATE_BENIGN_RACE(T* ptr) {
     AnnotateBenignRaceSized(__FILE__, __LINE__, ptr, sizeof(*ptr), "SK_ANNOTATE_BENIGN_RACE");
@@ skipping 48 matching lines @@
           T* get()       { return &fVal; }
 
     const T* operator->() const { return &fVal; }
           T* operator->()       { return &fVal; }
 
 private:
     T fVal;
 };
 
 #endif//SkDynamicAnnotations_DEFINED