Change Pickle to double its capacity by default, rather than increasing...

base/pickle.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/pickle.h"
 
 #include <stdlib.h>
 
 #include <limits>
 #include <string>
@@ skipping 245 matching lines @@
     return false;
 
   return ReadBytes(iter, data, *length);
 }
 
 char* Pickle::BeginWrite(size_t length) {
   // write at a uint32-aligned offset from the beginning of the header
   size_t offset = AlignInt(header_->payload_size, sizeof(uint32));
 
   size_t new_size = offset + length;
-  if (header_size_ + new_size > capacity_ && !Resize(header_size_ + new_size))
+  size_t needed_size = header_size_ + new_size;
+  if (needed_size > capacity_ && !Resize(std::max(capacity_ * 2, needed_size)))
     return NULL;
 
 #ifdef ARCH_CPU_64_BITS
   DCHECK_LE(length, std::numeric_limits<uint32>::max());
 #endif
 
   header_->payload_size = static_cast<uint32>(new_size);
   return payload() + offset;
 }
 
@@ skipping 101 matching lines @@
   DCHECK(header_size <= static_cast<size_t>(kPayloadUnit));
 
   const Header* hdr = reinterpret_cast<const Header*>(start);
   const char* payload_base = start + header_size;
   const char* payload_end = payload_base + hdr->payload_size;
   if (payload_end < payload_base)
     return NULL;
 
   return (payload_end > end) ? NULL : payload_end;
 }