Remove dependency on allocator from 'content' targets

base/allocator/tcmalloc_extension.cc

+// Copyright 2015 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/allocator/allocator_extension_thunks.h"
+
+#include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
+#include "third_party/tcmalloc/chromium/src/gperftools/malloc_extension.h"
+
+extern "C" {
+int tc_set_new_mode(int mode);
+}
+
+namespace {
+
+bool GetAllocatorWasteSizeHelper(size_t* size) {
+  size_t heap_size, allocated_bytes, unmapped_bytes;
+  MallocExtension* ext = MallocExtension::instance();
+  if (ext->GetNumericProperty("generic.heap_size", &heap_size) &&
+      ext->GetNumericProperty("generic.current_allocated_bytes",
+                              &allocated_bytes) &&
+      ext->GetNumericProperty("tcmalloc.pageheap_unmapped_bytes",
+                              &unmapped_bytes)) {
+    *size = heap_size - allocated_bytes - unmapped_bytes;
+    return true;
+  }
+  return false;
+}
+
+void GetStatsHelper(char* buffer, int buffer_length) {
+  MallocExtension::instance()->GetStats(buffer, buffer_length);
+}
+
+bool GetNumericPropertyHelper(const char* name, size_t* value) {
+  return MallocExtension::instance()->GetNumericProperty(name, value);
+}
+
+void ReleaseFreeMemoryHelper() {
+  MallocExtension::instance()->ReleaseFreeMemory();
+}
+
+unsigned int GetBytesAllocatedOnCurrentThreadHelper() {
+  return MallocExtension::instance()->GetBytesAllocatedOnCurrentThread();
+}
+
+bool IsHeapProfilerRunningHelper() {
+  return IsHeapProfilerRunning();
+}
+
+}  // namespace
+
+namespace base {
+namespace allocator {
+
+__attribute__((visibility("default"))) thunks::AllocatorExtensionFunctions
+InitializeAllocatorWeak();
+
+thunks::AllocatorExtensionFunctions InitializeAllocatorWeak() {
+  // For tcmalloc, we need to tell it to behave like new.
+  tc_set_new_mode(1);
+
+  thunks::AllocatorExtensionFunctions allocator_funtions = {
+      GetAllocatorWasteSizeHelper, GetStatsHelper,
+      ReleaseFreeMemoryHelper,     GetBytesAllocatedOnCurrentThreadHelper,
+      GetNumericPropertyHelper,    ::HeapProfilerWithPseudoStackStart,
+      ::HeapProfilerStop,          ::GetHeapProfile,
+      ::HeapProfilerDump,          IsHeapProfilerRunningHelper};
+  return allocator_funtions;
+}
+
+}  // namespace allocator
+}  // namespace base