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

src/gpu/GrBatch.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrBatch_DEFINED
 #define GrBatch_DEFINED
 
 #include <new>
 #include "GrBatchTarget.h"
 #include "GrGeometryProcessor.h"
 #include "GrVertices.h"
-#include "SkAtomics.h"
 #include "SkRefCnt.h"
+#include "SkThread.h"
 #include "SkTypes.h"
 
 class GrGpu;
 class GrPipeline;
 
 struct GrInitInvariantOutput;
 
 /*
  * GrBatch is the base class for all Ganesh deferred geometry generators.  To facilitate
  * reorderable batching, Ganesh does not generate geometry inline with draw calls.  Instead, it
  * captures the arguments to the draw and then generates the geometry on demand.  This gives GrBatch
  * subclasses complete freedom to decide how / what they can batch.
  *
  * Batches are created when GrContext processes a draw call. Batches of the same  subclass may be
  * merged using combineIfPossible. When two batches merge, one takes on the union of the data
  * and the other is left empty. The merged batch becomes responsible for drawing the data from both
  * the original batches.
  *
  * If there are any possible optimizations which might require knowing more about the full state of
  * the draw, ie whether or not the GrBatch is allowed to tweak alpha for coverage, then this
  * information will be communicated to the GrBatch prior to geometry generation.
  */
 
 class GrBatch : public SkRefCnt {
 public:
-
+    
     GrBatch() : fClassID(kIllegalBatchClassID), fNumberOfDraws(0) { SkDEBUGCODE(fUsed = false;) }
     virtual ~GrBatch() {}
 
     virtual const char* name() const = 0;
     virtual void getInvariantOutputColor(GrInitInvariantOutput* out) const = 0;
     virtual void getInvariantOutputCoverage(GrInitInvariantOutput* out) const = 0;
 
     /*
      * initBatchTracker is a hook for the some additional overrides / optimization possibilities
      * from the GrXferProcessor.
@@ skipping 116 matching lines @@
     static int32_t gCurrBatchClassID;
 
     SkDEBUGCODE(bool fUsed;)
 
     int fNumberOfDraws;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif