Replace uses of raw uint32's with a type-checked RtpTimeTicks data type.

chrome/common/cast_messages.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 "chrome/common/cast_messages.h"
+
+namespace IPC {
+
+void ParamTraits<media::cast::RtpTimeTicks>::Write(Message* m,
+                                                   const param_type& p) {
+  ParamTraits<uint64_t>::Write(m, p.SerializeForIPC());
+}
+
+bool ParamTraits<media::cast::RtpTimeTicks>::Read(
+    const Message* m, base::PickleIterator* iter, param_type* r) {
+  uint64_t serialized = UINT64_C(0);
+  if (ParamTraits<uint64_t>::Read(m, iter, &serialized)) {
+    *r = param_type::DeserializeForIPC(serialized);
+    return true;
+  }
+  return false;
+}
+
+void ParamTraits<media::cast::RtpTimeTicks>::Log(const param_type& p,
+                                                 std::string* l) {
+  std::ostringstream oss;
+  oss << p;
+  l->append(oss.str());
+}
+
+}  // namespace IPC