one more tsan fix

src/pathops/SkPathOpsDebug.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPathOpsDebug.h"
 #include "SkPath.h"
 
 #if defined SK_DEBUG || !FORCE_RELEASE
 
 const char* SkPathOpsDebug::kLVerbStr[] = {"", "line", "quad", "cubic"};
 
 #if defined(SK_DEBUG) || !FORCE_RELEASE
-int SkPathOpsDebug::gContourID;
-int SkPathOpsDebug::gSegmentID;
+int SkPathOpsDebug::gContourID = 0;
+int SkPathOpsDebug::gSegmentID = 0;
 #endif
 
 #if DEBUG_SORT || DEBUG_SWAP_TOP
 int SkPathOpsDebug::gSortCountDefault = SK_MaxS32;
 int SkPathOpsDebug::gSortCount;
 #endif
 
 #if DEBUG_ACTIVE_OP
 const char* SkPathOpsDebug::kPathOpStr[] = {"diff", "sect", "union", "xor"};
 #endif
@@ skipping 586 matching lines @@
         }
         last = &span;
         hasLoop |= last->fLoop;
     }
     SK_DEBUGBREAK(done == fDoneSpans);
     if (fAngles.count() ) {
         fAngles.begin()->debugValidateLoop();
     }
 #endif
 }