Add skia_tsan_build to match skia_asan_build and fix one example race.

tests/skia_test.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCommandLineFlags.h"
 #include "SkGraphics.h"
 #include "SkOSFile.h"
@@ skipping 66 matching lines @@
     virtual bool allowThreaded() const SK_OVERRIDE {
         return fAllowThreaded;
     }
 
     virtual bool verbose() const SK_OVERRIDE {
         return fVerbose;
     }
 
 protected:
     virtual void onStart(Test* test) {
-        const int index = sk_atomic_inc(&fNextIndex);
-        sk_atomic_inc(&fPending);
-        SkDebugf("[%3d/%3d] (%d) %s\n", index+1, fTotal, fPending, test->getName());
+        const int index = sk_atomic_inc(&fNextIndex)+1;
+        const int pending = sk_atomic_inc(&fPending)+1;
+        SkDebugf("[%3d/%3d] (%d) %s\n", index, fTotal, pending, test->getName());
     }
     virtual void onReportFailed(const SkString& desc) {
         SkDebugf("\tFAILED: %s\n", desc.c_str());
     }
 
     virtual void onEnd(Test* test) {
         if (!test->passed()) {
             SkDebugf("---- %s FAILED\n", test->getName());
         }
 
@@ skipping 164 matching lines @@
     GpuTest::DestroyContexts();
 
     return (failCount == 0) ? 0 : 1;
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif