Update from https://crrev.com/327068

base/trace_event/malloc_dump_provider.cc

Index: base/trace_event/malloc_dump_provider.cc
diff --git a/base/trace_event/malloc_dump_provider.cc b/base/trace_event/malloc_dump_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7d9931c16a7fc67d16eb8ef2bfbb1f147459f87f
--- /dev/null
+++ b/base/trace_event/malloc_dump_provider.cc
@@ -0,0 +1,64 @@
+// 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/trace_event/malloc_dump_provider.h"
+
+#include <malloc.h>
+
+#include "base/trace_event/process_memory_dump.h"
+
+namespace base {
+namespace trace_event {
+
+namespace {
+
+const char kDumperFriendlyName[] = "Malloc";
+
+}  // namespace
+
+// static
+MallocDumpProvider* MallocDumpProvider::GetInstance() {
+  return Singleton<MallocDumpProvider,
+                   LeakySingletonTraits<MallocDumpProvider>>::get();
+}
+
+MallocDumpProvider::MallocDumpProvider() {
+}
+
+MallocDumpProvider::~MallocDumpProvider() {
+}
+
+// Called at trace dump point time. Creates a snapshot the memory counters for
+// the current process.
+bool MallocDumpProvider::DumpInto(ProcessMemoryDump* pmd) {
+  struct mallinfo info = mallinfo();
+  DCHECK_GE(info.arena + info.hblkhd, info.uordblks);
+
+  MemoryAllocatorDump* dump =
+      pmd->CreateAllocatorDump("malloc", MemoryAllocatorDump::kRootHeap);
+  if (!dump)
+    return false;
+
+  // When the system allocator is implemented by tcmalloc, the total physical
+  // size is given by |arena| and |hblkhd| is 0. In case of Android's jemalloc
+  // |arena| is 0 and the outer pages size is reported by |hblkhd|. In case of
+  // dlmalloc the total is given by |arena| + |hblkhd|.
+  // For more details see link: http://goo.gl/fMR8lF.
+  dump->set_physical_size_in_bytes(info.arena + info.hblkhd);
+
+  // mallinfo doesn't support any allocated object count.
+  dump->set_allocated_objects_count(0);
+
+  // Total allocated space is given by |uordblks|.
+  dump->set_allocated_objects_size_in_bytes(info.uordblks);
+
+  return true;
+}
+
+const char* MallocDumpProvider::GetFriendlyName() const {
+  return kDumperFriendlyName;
+}
+
+}  // namespace trace_event
+}  // namespace base