Move IPC fuzzer switches and helpers from chrome/common to content/common.

chrome/common/external_ipc_dumper.cc

-// Copyright (c) 2015 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 "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/native_library.h"
-#include "base/path_service.h"
-#include "build/build_config.h"
-#include "chrome/common/external_ipc_dumper.h"
-
-typedef IPC::ChannelProxy::OutgoingMessageFilter* (*GetFilterFunction)();
-typedef void (*SetDumpDirectoryFunction)(const base::FilePath&);
-
-const char kFilterEntryName[] = "GetFilter";
-const char kSetDumpDirectoryEntryName[] = "SetDumpDirectory";
-
-#if defined(OS_WIN)
-#define IPC_MESSAGE_DUMP_MODULE FILE_PATH_LITERAL("ipc_message_dump.dll")
-#else
-#define IPC_MESSAGE_DUMP_MODULE FILE_PATH_LITERAL("libipc_message_dump.so")
-#endif
-
-IPC::ChannelProxy::OutgoingMessageFilter* LoadExternalIPCDumper(
-    const base::FilePath& dump_directory) {
-  base::FilePath module_path;
-  if (!PathService::Get(base::DIR_MODULE, &module_path)) {
-    LOG(ERROR) << "Unable to get message dump module directory.";
-    return NULL;
-  }
-
-  base::FilePath library_path = module_path.Append(IPC_MESSAGE_DUMP_MODULE);
-  base::NativeLibraryLoadError load_error;
-  base::NativeLibrary library =
-      base::LoadNativeLibrary(library_path, &load_error);
-
-  if (!library) {
-    LOG(ERROR) << load_error.ToString();
-    return NULL;
-  }
-
-  SetDumpDirectoryFunction set_directory_entry_point =
-      reinterpret_cast<SetDumpDirectoryFunction>(
-          base::GetFunctionPointerFromNativeLibrary(
-              library, kSetDumpDirectoryEntryName));
-  if (!set_directory_entry_point) {
-    LOG(ERROR) << kSetDumpDirectoryEntryName
-               << " not exported by message dump module.";
-    return NULL;
-  }
-  set_directory_entry_point(dump_directory);
-
-  GetFilterFunction filter_entry_point = reinterpret_cast<GetFilterFunction>(
-      base::GetFunctionPointerFromNativeLibrary(library, kFilterEntryName));
-  if (!filter_entry_point) {
-    LOG(ERROR) << kFilterEntryName << " not exported by message dump module.";
-    return NULL;
-  }
-
-  return filter_entry_point();
-}