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

src/core/SkRegionPriv.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkRegionPriv_DEFINED
 #define SkRegionPriv_DEFINED
 
 #include "SkRegion.h"
-#include "SkAtomics.h"
+#include "SkThread.h"
 
 #define assert_sentinel(value, isSentinel) \
     SkASSERT(((value) == SkRegion::kRunTypeSentinel) == isSentinel)
 
 //SkDEBUGCODE(extern int32_t gRgnAllocCounter;)
 
 #ifdef SK_DEBUG
 // Given the first interval (just past the interval-count), compute the
 // interval count, by search for the x-sentinel
 //
@@ skipping 202 matching lines @@
         bounds->fRight = rite;
         bounds->fBottom = bot;
     }
 
 private:
     int32_t fYSpanCount;
     int32_t fIntervalCount;
 };
 
 #endif