Align base::Pickle allocations to 4k boundaries

base/pickle.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_PICKLE_H_
 #define BASE_PICKLE_H_
 
 #include <string>
 
 #include "base/base_export.h"
@@ skipping 56 matching lines @@
     return ReadInt(result) && *result >= 0;
   }
 
   // Skips bytes in the read buffer and returns true if there are at least
   // num_bytes available. Otherwise, does nothing and returns false.
   bool SkipBytes(int num_bytes) WARN_UNUSED_RESULT {
     return !!GetReadPointerAndAdvance(num_bytes);
   }
 
  private:
-  // Aligns 'i' by rounding it up to the next multiple of 'alignment'.
-  static size_t AlignInt(size_t i, int alignment) {
-    return i + (alignment - (i % alignment)) % alignment;
-  }
-
   // Read Type from Pickle.
   template <typename Type>
   bool ReadBuiltinType(Type* result);
 
   // Advance read_index_ but do not allow it to exceed end_index_.
   // Keeps read_index_ aligned.
   void Advance(size_t size);
 
   // Get read pointer for Type and advance read pointer.
   template<typename Type>
@@ skipping 171 matching lines @@
   }
 
   size_t capacity_after_header() const {
     return capacity_after_header_;
   }
 
   // Resize the capacity, note that the input value should not include the size
   // of the header.
   void Resize(size_t new_capacity);
 
-  // Aligns 'i' by rounding it up to the next multiple of 'alignment'
-  static size_t AlignInt(size_t i, int alignment) {
-    return i + (alignment - (i % alignment)) % alignment;
-  }
-
   // Find the end of the pickled data that starts at range_start.  Returns NULL
   // if the entire Pickle is not found in the given data range.
   static const char* FindNext(size_t header_size,
                               const char* range_start,
                               const char* range_end);
 
   // The allocation granularity of the payload.
   static const int kPayloadUnit;
 
  private:
@@ skipping 20 matching lines @@
 
   FRIEND_TEST_ALL_PREFIXES(PickleTest, Resize);
   FRIEND_TEST_ALL_PREFIXES(PickleTest, FindNext);
   FRIEND_TEST_ALL_PREFIXES(PickleTest, FindNextWithIncompleteHeader);
   FRIEND_TEST_ALL_PREFIXES(PickleTest, FindNextOverflow);
 };
 
 }  // namespace base
 
 #endif  // BASE_PICKLE_H_