Merge tcmalloc r111 (perftools v. 1.8) with the chromium/ branch.

third_party/tcmalloc/chromium/src/malloc_hook-inl.h

 // Copyright (c) 2005, 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 86 matching lines @@
 extern AtomicPtr<MallocHook::PreSbrkHook> presbrk_hook_;
 extern AtomicPtr<MallocHook::SbrkHook>    sbrk_hook_;
 // End DEPRECATED code.
 
 // Maximum of 7 hooks means that HookList is 8 words.
 static const int kHookListMaxValues = 7;
 
 // HookList: a class that provides synchronized insertions and removals and
 // lockless traversal.  Most of the implementation is in malloc_hook.cc.
 template <typename T>
-struct HookList {
+struct PERFTOOLS_DLL_DECL HookList {
   COMPILE_ASSERT(sizeof(T) <= sizeof(AtomicWord), T_should_fit_in_AtomicWord);
 
   // Adds value to the list.  Note that duplicates are allowed.  Thread-safe and
   // blocking (acquires hooklist_spinlock).  Returns true on success; false
   // otherwise (failures include invalid value and no space left).
   bool Add(T value);
 
   // Removes the first entry matching value from the list.  Thread-safe and
   // blocking (acquires hooklist_spinlock).  Returns true on success; false
   // otherwise (failures include invalid value and no value found).
@@ skipping 195 matching lines @@
   if (!base::internal::sbrk_hooks_.empty() && increment != 0) {
     InvokeSbrkHookSlow(result, increment);
   }
   // The following code is DEPRECATED.
   MallocHook::SbrkHook hook = MallocHook::GetSbrkHook();
   if (hook != NULL && increment != 0) (*hook)(result, increment);
   // End DEPRECATED code.
 }
 
 #endif /* _MALLOC_HOOK_INL_H_ */