Generate param traits even when shared by mutliple message files.

content/public/common/common_param_traits.cc

Index: content/public/common/common_param_traits.cc
===================================================================
--- content/public/common/common_param_traits.cc	(revision 143049)
+++ content/public/common/common_param_traits.cc	(working copy)
@@ -553,39 +553,22 @@
   l->append("<SkBitmap>");
 }
 
-void ParamTraits<content::ConsoleMessageLevel>::Write(Message* m,
-                                                      const param_type& p) {
-  m->WriteInt(static_cast<int>(p));
-}
+}  // namespace IPC
 
-bool ParamTraits<content::ConsoleMessageLevel>::Read(const Message* m,
-                                                     PickleIterator* iter,
-                                                     param_type* p) {
-  int type;
-  if (!m->ReadInt(iter, &type))
-    return false;
-  *p = static_cast<param_type>(type);
-  return true;
-}
+// Generate param traits write methods.
+#include "ipc/param_traits_write_macros.h"
+namespace IPC {
+#include "content/public/common/common_param_traits_defs.h"
+}  // namespace IPC
 
-void ParamTraits<content::ConsoleMessageLevel>::Log(const param_type& p,
-                                                    std::string* l) {
-  std::string level;
-  switch (p) {
-    case content::CONSOLE_MESSAGE_LEVEL_TIP:
-      level = "CONSOLE_MESSAGE_LEVEL_TIP";
-      break;
-    case content::CONSOLE_MESSAGE_LEVEL_LOG:
-      level = "CONSOLE_MESSAGE_LEVEL_LOG";
-      break;
-    case content::CONSOLE_MESSAGE_LEVEL_WARNING:
-      level = "CONSOLE_MESSAGE_LEVEL_WARNING";
-      break;
-    case content::CONSOLE_MESSAGE_LEVEL_ERROR:
-      level = "CONSOLE_MESSAGE_LEVEL_ERROR";
-      break;
-  }
-  LogParam(level, l);
-}
+// Generate param traits read methods.
+#include "ipc/param_traits_read_macros.h"
+namespace IPC {
+#include "content/public/common/common_param_traits_defs.h"
+}  // namespace IPC
 
+// Generate param traits log methods.
+#include "ipc/param_traits_log_macros.h"
+namespace IPC {
+#include "content/public/common/common_param_traits_defs.h"
 }  // namespace IPC