More win64 warning fixes

src/gpu/GrSWMaskHelper.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrSWMaskHelper_DEFINED
 #define GrSWMaskHelper_DEFINED
 
@@ skipping 110 matching lines @@
     // only allocated (non-null) if fCompressionMode is kBlitter_CompressionMode
     SkAutoMalloc fCompressedBuffer;
 
     // This is the desired format within which to compress the
     // texture. This value is only valid if fCompressionMode is not kNone_CompressionMode.
     SkTextureCompressor::Format fCompressedFormat;
 
     // Actually sends the texture data to the GPU. This is called from
     // toTexture with the data filled in depending on the texture config.
     void sendTextureData(GrTexture *texture, const GrSurfaceDesc& desc,
-                         const void *data, int rowbytes);
+                         const void *data, size_t rowbytes);
 
     // Compresses the bitmap stored in fBM and sends the compressed data
     // to the GPU to be stored in 'texture' using sendTextureData.
     void compressTextureData(GrTexture *texture, const GrSurfaceDesc& desc);
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif // GrSWMaskHelper_DEFINED