Make AudioParameters a class instead of a struct

content/public/common/common_param_traits.cc

Index: content/public/common/common_param_traits.cc
diff --git a/content/public/common/common_param_traits.cc b/content/public/common/common_param_traits.cc
index 22bb7a9dad481284ec099baf1f1e8165a163fd7f..4ca3ffde28be416f6b8f748a7cf23990827f4cf9 100644
--- a/content/public/common/common_param_traits.cc
+++ b/content/public/common/common_param_traits.cc
@@ -508,6 +508,39 @@ void ParamTraits<gfx::Rect>::Log(const gfx::Rect& p, std::string* l) {
                                p.width(), p.height()));
 }
 
+void ParamTraits<AudioParameters>::Write(Message* m,
+                                         const AudioParameters& p) {
+  m->WriteInt(static_cast<int>(p.format()));
+  m->WriteInt(static_cast<int>(p.channel_layout()));
+  m->WriteInt(p.samples_per_second());
+  m->WriteInt(p.bits_per_sample());
+  m->WriteInt(p.samples_per_packet());
+  m->WriteInt(p.channels());
+}
+
+bool ParamTraits<AudioParameters>::Read(const Message* m, void** iter,
+                                        AudioParameters* r) {
+  int format, channel_layout, samples_per_second, bits_per_sample,
+      samples_per_packet, channels;
+
+  if (!m->ReadInt(iter, &format) ||
+      !m->ReadInt(iter, &channel_layout) ||
+      !m->ReadInt(iter, &samples_per_second) ||
+      !m->ReadInt(iter, &bits_per_sample) ||
+      !m->ReadInt(iter, &samples_per_packet) ||
+      !m->ReadInt(iter, &channels))
+    return false;
+  r->Reset(static_cast<AudioParameters::Format>(format),
+           static_cast<ChannelLayout>(channel_layout),
+           samples_per_second, bits_per_sample, samples_per_packet);
+  return true;
+}
+
+void ParamTraits<AudioParameters>::Log(const AudioParameters& p,
+                                       std::string* l) {
+  l->append(base::StringPrintf("<AudioParameters>"));
+}
+
 void ParamTraits<ui::Range>::Write(Message* m, const ui::Range& r) {
   m->WriteSize(r.start());
   m->WriteSize(r.end());