Completely revert all my IPC work to see if this was what regressed the page cycler.

ipc/ipc_message_utils.cc

 // Copyright (c) 2009 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 "ipc/ipc_message_utils.h"
 
-#include "base/file_path.h"
 #include "base/json/json_writer.h"
-#include "base/nullable_string16.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "base/values.h"
-#if defined(OS_POSIX)
-#include "ipc/file_descriptor_set_posix.h"
-#endif
-#include "ipc/ipc_channel_handle.h"
 
 namespace IPC {
 
 const int kMaxRecursionDepth = 100;
 
 // Value serialization
 
 static bool ReadValue(const Message* m, void** iter, Value** value,
                       int recursion);
 
@@ skipping 173 matching lines @@
       *value = val.release();
       break;
     }
     default:
     return false;
   }
 
   return true;
 }
 
-
-void ParamTraits<base::Time>::Write(Message* m, const param_type& p) {
-  ParamTraits<int64>::Write(m, p.ToInternalValue());
-}
-
-bool ParamTraits<base::Time>::Read(const Message* m, void** iter,
-                                   param_type* r) {
-  int64 value;
-  if (!ParamTraits<int64>::Read(m, iter, &value))
-    return false;
-  *r = base::Time::FromInternalValue(value);
-  return true;
-}
-
-void ParamTraits<base::Time>::Log(const param_type& p, std::wstring* l) {
-  ParamTraits<int64>::Log(p.ToInternalValue(), l);
-}
-
 void ParamTraits<DictionaryValue>::Write(Message* m, const param_type& p) {
   WriteValue(m, &p, 0);
 }
 
 bool ParamTraits<DictionaryValue>::Read(
     const Message* m, void** iter, param_type* r) {
   int type;
   if (!ReadParam(m, iter, &type) || type != Value::TYPE_DICTIONARY)
     return false;
 
@@ skipping 17 matching lines @@
     return false;
 
   return ReadListValue(m, iter, r, 0);
 }
 
 void ParamTraits<ListValue>::Log(const param_type& p, std::wstring* l) {
   std::string json;
   base::JSONWriter::Write(&p, false, &json);
   l->append(UTF8ToWide(json));
 }
-
-void ParamTraits<NullableString16>::Write(Message* m, const param_type& p) {
-  WriteParam(m, p.string());
-  WriteParam(m, p.is_null());
-}
-
-bool ParamTraits<NullableString16>::Read(const Message* m, void** iter,
-                                         param_type* r) {
-  string16 string;
-  if (!ReadParam(m, iter, &string))
-    return false;
-  bool is_null;
-  if (!ReadParam(m, iter, &is_null))
-    return false;
-  *r = NullableString16(string, is_null);
-  return true;
-}
-
-void ParamTraits<NullableString16>::Log(const param_type& p, std::wstring* l) {
-  l->append(L"(");
-  LogParam(p.string(), l);
-  l->append(L", ");
-  LogParam(p.is_null(), l);
-  l->append(L")");
-}
-
-void ParamTraits<FilePath>::Write(Message* m, const param_type& p) {
-  ParamTraits<FilePath::StringType>::Write(m, p.value());
-}
-
-bool ParamTraits<FilePath>::Read(const Message* m, void** iter, param_type* r) {
-  FilePath::StringType value;
-  if (!ParamTraits<FilePath::StringType>::Read(m, iter, &value))
-    return false;
-  *r = FilePath(value);
-  return true;
-}
-
-void ParamTraits<FilePath>::Log(const param_type& p, std::wstring* l) {
-  ParamTraits<FilePath::StringType>::Log(p.value(), l);
-}
-
-#if defined(OS_POSIX)
-void ParamTraits<base::FileDescriptor>::Write(Message* m, const param_type& p) {
-  const bool valid = p.fd >= 0;
-  WriteParam(m, valid);
-
-  if (valid) {
-    if (!m->WriteFileDescriptor(p))
-      NOTREACHED();
-  }
-}
-
-bool ParamTraits<base::FileDescriptor>::Read(const Message* m, void** iter,
-                                             param_type* r) {
-  bool valid;
-  if (!ReadParam(m, iter, &valid))
-    return false;
-
-  if (!valid) {
-    r->fd = -1;
-    r->auto_close = false;
-    return true;
-  }
-
-  return m->ReadFileDescriptor(iter, r);
-}
-
-void ParamTraits<base::FileDescriptor>::Log(const param_type& p,
-                                            std::wstring* l) {
-  if (p.auto_close) {
-    l->append(StringPrintf(L"FD(%d auto-close)", p.fd));
-  } else {
-    l->append(StringPrintf(L"FD(%d)", p.fd));
-  }
-}
-#endif  // defined(OS_POSIX)
-
-void ParamTraits<IPC::ChannelHandle>::Write(Message* m, const param_type& p) {
-  WriteParam(m, p.name);
-#if defined(OS_POSIX)
-  WriteParam(m, p.socket);
-#endif
-}
-
-bool ParamTraits<IPC::ChannelHandle>::Read(const Message* m, void** iter,
-                                           param_type* r) {
-  return ReadParam(m, iter, &r->name)
-#if defined(OS_POSIX)
-      && ReadParam(m, iter, &r->socket)
-#endif
-      ;
-}
-
-void ParamTraits<IPC::ChannelHandle>::Log(const param_type& p,
-                                          std::wstring* l) {
-  l->append(ASCIIToWide(StringPrintf("ChannelHandle(%s", p.name.c_str())));
-#if defined(OS_POSIX)
-  ParamTraits<base::FileDescriptor>::Log(p.socket, l);
-#endif
-  l->append(L")");
-}
-
 }  // namespace IPC