change impl to explicitly store length as u32, rather than size_t, so we keep a packed struct on 64…

include/core/SkString.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 SkString_DEFINED
@@ skipping 187 matching lines @@
 
     /**
      *  Swap contents between this and other. This function is guaranteed
      *  to never fail or throw.
      */
     void swap(SkString& other);
 
 private:
     struct Rec {
     public:
-        size_t      fLength;
+        uint32_t    fLength; // logically size_t, but we want it to stay 32bits
         int32_t     fRefCnt;
         char        fBeginningOfData;
 
         char* data() { return &fBeginningOfData; }
         const char* data() const { return &fBeginningOfData; }
     };
     Rec* fRec;
 
 #ifdef SK_DEBUG
     const char* fStr;
@@ skipping 28 matching lines @@
 /// Creates a new string and writes into it using a printf()-style format.
 SkString SkStringPrintf(const char* format, ...);
 
 // Specialized to take advantage of SkString's fast swap path. The unspecialized function is
 // declared in SkTypes.h and called by SkTSort.
 template <> inline void SkTSwap(SkString& a, SkString& b) {
     a.swap(b);
 }
 
 #endif