Update from https://crrev.com/317530

base/trace_event/process_memory_totals.cc

Index: base/trace_event/process_memory_totals.cc
diff --git a/base/trace_event/process_memory_totals.cc b/base/trace_event/process_memory_totals.cc
new file mode 100644
index 0000000000000000000000000000000000000000..41ad788ea4bff48097461f16670fee084087d923
--- /dev/null
+++ b/base/trace_event/process_memory_totals.cc
@@ -0,0 +1,17 @@
+// 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/process_memory_totals.h"
+
+#include "base/trace_event/trace_event_argument.h"
+
+namespace base {
+namespace trace_event {
+
+void ProcessMemoryTotals::AsValueInto(TracedValue* value) const {
+  value->SetDouble("resident_set_bytes", resident_set_bytes_);
+}
+
+}  // namespace trace_event
+}  // namespace base