Update from https://crrev.com/317530

base/trace_event/process_memory_totals.h

Index: base/trace_event/process_memory_totals.h
diff --git a/base/trace_event/process_memory_totals.h b/base/trace_event/process_memory_totals.h
new file mode 100644
index 0000000000000000000000000000000000000000..1c99152fa84b6086163393c247be39d146ee0334
--- /dev/null
+++ b/base/trace_event/process_memory_totals.h
@@ -0,0 +1,36 @@
+// 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.
+
+#ifndef BASE_TRACE_EVENT_PROCESS_MEMORY_TOTALS_H_
+#define BASE_TRACE_EVENT_PROCESS_MEMORY_TOTALS_H_
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+
+namespace base {
+namespace trace_event {
+
+class TracedValue;
+
+// Dump provider which collects process-wide memory stats.
+class BASE_EXPORT ProcessMemoryTotals {
+ public:
+  ProcessMemoryTotals() {}
+
+  // Called at trace generation time to populate the TracedValue.
+  void AsValueInto(TracedValue* value) const;
+
+  uint64 resident_set_bytes() const { return resident_set_bytes_; }
+  void set_resident_set_bytes(uint64 value) { resident_set_bytes_ = value; }
+
+ private:
+  uint64 resident_set_bytes_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessMemoryTotals);
+};
+
+}  // namespace trace_event
+}  // namespace base
+
+#endif  // BASE_TRACE_EVENT_PROCESS_MEMORY_TOTALS_H_