Revert of Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.

src/core/SkPath.cpp

Index: src/core/SkPath.cpp
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 9381f48f3bf7952822725ab347fe8236d6dff7c8..daac0772dcde6b55c19e8be6faeddbfa0f1187d8 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -12,6 +12,7 @@
 #include "SkPathPriv.h"
 #include "SkPathRef.h"
 #include "SkRRect.h"
+#include "SkThread.h"
 
 ////////////////////////////////////////////////////////////////////////////
 
@@ -1880,7 +1881,7 @@
     }
 
     unsigned version = packed & 0xFF;
-
+    
     fConvexity = (packed >> kConvexity_SerializationShift) & 0xFF;
     fFillType = (packed >> kFillType_SerializationShift) & 0xFF;
     uint8_t dir = (packed >> kDirection_SerializationShift) & 0x3;