[UMA] Use proper C++ objects to serialize tracked_objects across process boundaries.

content/public/common/serialized_profiler_data.cc

+// Copyright (c) 2012 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 "content/public/common/serialized_profiler_data.h"
+
+#include "base/values.h"
+
+namespace content {
+
+//------------------------------------------------------------------------------
+SerializedProfilerData::SerializedProfilerData() {
+}
+
+SerializedProfilerData::SerializedProfilerData(
+    content::ProcessType process_type)
+        : process_type(process_type) {
+}
+
+SerializedProfilerData::~SerializedProfilerData() {
+}
+
+void SerializedProfilerData::ToValue(base::DictionaryValue* dictionary) const {
+  tracked_objects::SerializedProcessData::ToValue(dictionary);
+  dictionary->SetString("process_type",
+                        content::GetProcessTypeNameInEnglish(process_type));
+}
+
+}  // namespace content