Introduce allocator shim for Android

base/allocator/allocator_shim_override_linker_wrapped_symbols.h

+// Copyright 2016 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.
+
+#ifdef BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_LINKER_WRAPPED_SYMBOLS_H_
+#error This header is meant to be included only once by allocator_shim.cc
+#endif
+#define BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_LINKER_WRAPPED_SYMBOLS_H_
+
+// This header overrides the __wrap_X symbols when using the link-time
+// -Wl,-wrap,malloc shim-layer approach (see README.md).
+// All references to malloc, free, etc. within the linker unit that gets the
+// -wrap linker flags (e.g., libchrome_public.so) will be rewritten to the
+// linker as references to __wrap_malloc, __wrap_free, which are defined here.
+
+#include "base/allocator/allocator_shim_internals.h"
+
+extern "C" {
+
+SHIM_ALWAYS_EXPORT void* __wrap_calloc(size_t, size_t)
+    SHIM_ALIAS_SYMBOL(ShimCalloc);
+
+SHIM_ALWAYS_EXPORT void __wrap_free(void*)
+    SHIM_ALIAS_SYMBOL(ShimFree);
+
+SHIM_ALWAYS_EXPORT void* __wrap_malloc(size_t)
+    SHIM_ALIAS_SYMBOL(ShimMalloc);
+
+SHIM_ALWAYS_EXPORT void* __wrap_memalign(size_t, size_t)
+    SHIM_ALIAS_SYMBOL(ShimMemalign);
+
+SHIM_ALWAYS_EXPORT int __wrap_posix_memalign(void**, size_t, size_t)
+    SHIM_ALIAS_SYMBOL(ShimPosixMemalign);
+
+SHIM_ALWAYS_EXPORT void* __wrap_pvalloc(size_t)
+    SHIM_ALIAS_SYMBOL(ShimPvalloc);
+
+SHIM_ALWAYS_EXPORT void* __wrap_realloc(void*, size_t)
+    SHIM_ALIAS_SYMBOL(ShimRealloc);
+
+SHIM_ALWAYS_EXPORT void* __wrap_valloc(size_t)
+    SHIM_ALIAS_SYMBOL(ShimValloc);
+
+}  // extern "C"