Add size_t bytesWritten() const to SkWStream.

include/core/SkTypes.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 SkTypes_DEFINED
 #define SkTypes_DEFINED
 
@@ skipping 201 matching lines @@
 
 #ifdef SK_DEBUG
     SK_API int8_t      SkToS8(intmax_t);
     SK_API uint8_t     SkToU8(uintmax_t);
     SK_API int16_t     SkToS16(intmax_t);
     SK_API uint16_t    SkToU16(uintmax_t);
     SK_API int32_t     SkToS32(intmax_t);
     SK_API uint32_t    SkToU32(uintmax_t);
     SK_API int         SkToInt(intmax_t);
     SK_API unsigned    SkToUInt(uintmax_t);
+    SK_API size_t      SkToSizeT(uintmax_t);
 #else
     #define SkToS8(x)   ((int8_t)(x))
     #define SkToU8(x)   ((uint8_t)(x))
     #define SkToS16(x)  ((int16_t)(x))
     #define SkToU16(x)  ((uint16_t)(x))
     #define SkToS32(x)  ((int32_t)(x))
     #define SkToU32(x)  ((uint32_t)(x))
     #define SkToInt(x)  ((int)(x))
     #define SkToUInt(x) ((unsigned)(x))
+    #define SkToSizeT(x) ((size_t)(x))
 #endif
 
 /** Returns 0 or 1 based on the condition
 */
 #define SkToBool(cond)  ((cond) != 0)
 
 #define SK_MaxS16   32767
 #define SK_MinS16   -32767
 #define SK_MaxU16   0xFFFF
 #define SK_MinU16   0
@@ skipping 391 matching lines @@
 private:
     void*       fPtr;
     size_t      fSize;  // can be larger than the requested size (see kReuse)
     uint32_t    fStorage[(kSize + 3) >> 2];
 };
 // Can't guard the constructor because it's a template class.
 
 #endif /* C++ */
 
 #endif