mac: Hook up allocator shim.

base/process/memory.h

 // Copyright (c) 2013 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_PROCESS_MEMORY_H_
 #define BASE_PROCESS_MEMORY_H_
 
 #include <stddef.h>
 
 #include "base/base_export.h"
 #include "base/process/process_handle.h"
 #include "build/build_config.h"
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+#include <mach/mach_vm.h>
+#include "third_party/apple_apsl/malloc.h"
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
 #ifdef PVALLOC_AVAILABLE
 // Build config explicitly tells us whether or not pvalloc is available.
 #elif defined(LIBC_GLIBC) && !defined(USE_TCMALLOC)
 #define PVALLOC_AVAILABLE 1
 #else
 #define PVALLOC_AVAILABLE 0
 #endif
 
 namespace base {
 
@@ skipping 17 matching lines @@
 // This adjusts /proc/<pid>/oom_score_adj so the Linux OOM killer will
 // prefer to kill certain process types over others. The range for the
 // adjustment is [-1000, 1000], with [0, 1000] being user accessible.
 // If the Linux system doesn't support the newer oom_score_adj range
 // of [0, 1000], then we revert to using the older oom_adj, and
 // translate the given value into [0, 15].  Some aliasing of values
 // may occur in that case, of course.
 BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score);
 #endif
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+void DeprotectMallocZone(ChromeMallocZone* default_zone,
+                         mach_vm_address_t* reprotection_start,
+                         mach_vm_size_t* reprotection_length,
+                         vm_prot_t* reprotection_value);
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
 #if defined(OS_WIN)
 namespace win {
 
 // Custom Windows exception code chosen to indicate an out of memory error.
 // See https://msdn.microsoft.com/en-us/library/het71c37.aspx.
 // "To make sure that you do not define a code that conflicts with an existing
 // exception code" ... "The resulting error code should therefore have the
 // highest four bits set to hexadecimal E."
 // 0xe0000008 was chosen arbitrarily, as 0x00000008 is ERROR_NOT_ENOUGH_MEMORY.
 const DWORD kOomExceptionCode = 0xe0000008;
@@ skipping 13 matching lines @@
 // set to NULL, otherwise it holds the memory address.
 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedMalloc(size_t size,
                                                     void** result);
 BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedCalloc(size_t num_items,
                                                     size_t size,
                                                     void** result);
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_MEMORY_H_