V8ScriptValueSerializer: Use PartitionAlloc for the buffer, and avoid copying it into a String.

third_party/WebKit/Source/wtf/allocator/Partitions.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 72 matching lines @@
 
   static void decommitFreeableMemory();
 
   static void reportMemoryUsageHistogram();
 
   static void dumpMemoryStats(bool isLightDump, PartitionStatsDumper*);
 
   ALWAYS_INLINE static void* bufferMalloc(size_t n, const char* typeName) {
     return partitionAllocGeneric(bufferPartition(), n, typeName);
   }
+  ALWAYS_INLINE static void* bufferRealloc(void* p,
+                                           size_t n,
+                                           const char* typeName) {
+    return partitionReallocGeneric(bufferPartition(), p, n, typeName);
+  }
   ALWAYS_INLINE static void bufferFree(void* p) {
     partitionFreeGeneric(bufferPartition(), p);
   }
   ALWAYS_INLINE static size_t bufferActualSize(size_t n) {
     return partitionAllocActualSize(bufferPartition(), n);
   }
   static void* fastMalloc(size_t n, const char* typeName) {
     return partitionAllocGeneric(Partitions::fastMallocPartition(), n,
                                  typeName);
   }
@@ skipping 30 matching lines @@
   //   - Fast malloc partition: A partition to allocate all other objects.
   static PartitionAllocatorGeneric m_fastMallocAllocator;
   static PartitionAllocatorGeneric m_bufferAllocator;
   static SizeSpecificPartitionAllocator<1024> m_layoutAllocator;
   static ReportPartitionAllocSizeFunction m_reportSizeFunction;
 };
 
 }  // namespace WTF
 
 #endif  // Partitions_h