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

device/bluetooth/bluetooth_uuid.h

Index: device/bluetooth/bluetooth_uuid.h
diff --git a/device/bluetooth/bluetooth_uuid.h b/device/bluetooth/bluetooth_uuid.h
index f36e8b540fa2210693b1dd7ddaf8039a61dcd208..a1881c5edc456fc79cd56b3f80a590283f15682c 100644
--- a/device/bluetooth/bluetooth_uuid.h
+++ b/device/bluetooth/bluetooth_uuid.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "base/pickle.h"
 #include "device/bluetooth/bluetooth_export.h"
 #include "ipc/ipc_param_traits.h"
 
@@ -111,6 +112,7 @@ class Message;
 template <>
 struct DEVICE_BLUETOOTH_EXPORT ParamTraits<device::BluetoothUUID> {
   typedef device::BluetoothUUID param_type;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,