Generate param traits size methods for IPC files in content/ (and traits it depends on).

device/bluetooth/bluetooth_uuid.cc

Index: device/bluetooth/bluetooth_uuid.cc
diff --git a/device/bluetooth/bluetooth_uuid.cc b/device/bluetooth/bluetooth_uuid.cc
index 7a275e586edef6d4e8f855ad8d0900654703f580..7e55bc9d11849b7f03efc74c1d349ba08901a605 100644
--- a/device/bluetooth/bluetooth_uuid.cc
+++ b/device/bluetooth/bluetooth_uuid.cc
@@ -9,6 +9,7 @@
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "ipc/ipc_message.h"
+#include "ipc/ipc_message_utils.h"
 
 namespace device {
 
@@ -96,6 +97,11 @@ void PrintTo(const BluetoothUUID& uuid, std::ostream* out) {
 
 }  // namespace device
 
+void IPC::ParamTraits<device::BluetoothUUID>::GetSize(base::PickleSizer* s,
+                                                      const param_type& p) {
+  IPC::GetParamSize(s, p.canonical_value());
+}
+
 void IPC::ParamTraits<device::BluetoothUUID>::Write(base::Pickle* m,
                                                     const param_type& p) {
   m->WriteString(p.canonical_value());