Port SkLazyPtr to new SkAtomics.h

include/core/SkPixelRef.h

 /*
  * Copyright 2008 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 SkPixelRef_DEFINED
 #define SkPixelRef_DEFINED
 
 #include "SkBitmap.h"
 #include "SkDynamicAnnotations.h"
+#include "SkMutex.h"
 #include "SkRefCnt.h"
 #include "SkString.h"
 #include "SkImageInfo.h"
 #include "SkSize.h"
 #include "SkTDArray.h"
 
 //#define xed
 
 #ifdef SK_DEBUG
     /**
      *  Defining SK_IGNORE_PIXELREF_SETPRELOCKED will force all pixelref
      *  subclasses to correctly handle lock/unlock pixels. For performance
      *  reasons, simple malloc-based subclasses call setPreLocked() to skip
      *  the overhead of implementing these calls.
      *
      *  This build-flag disables that optimization, to add in debugging our
      *  call-sites, to ensure that they correctly balance their calls of
      *  lock and unlock.
      */
 //    #define SK_IGNORE_PIXELREF_SETPRELOCKED
 #endif
 
 class SkColorTable;
 class SkData;
 struct SkIRect;
-class SkMutex;
 
 class GrTexture;
 
 /** \class SkPixelRef
 
     This class is the smart container for pixel memory, and is used with
     SkBitmap. A pixelref is installed into a bitmap, and then the bitmap can
     access the actual pixel memory by calling lockPixels/unlockPixels.
 
     This class can be shared/accessed between multiple threads.
@@ skipping 337 matching lines @@
     /**
      *  Allocate a new pixelref matching the specified ImageInfo, allocating
      *  the memory for the pixels. If the ImageInfo requires a ColorTable,
      *  the pixelref will ref() the colortable.
      *  On failure return NULL.
      */
     virtual SkPixelRef* create(const SkImageInfo&, size_t rowBytes, SkColorTable*) = 0;
 };
 
 #endif