Decouple IPC::MessageFilter from IPC::Channel

content/browser/browser_message_filter_peer.cc

Index: content/browser/browser_message_filter_peer.cc
diff --git a/content/browser/browser_message_filter_peer.cc b/content/browser/browser_message_filter_peer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5104c008988393ee40944ee0d333776ba3404fbd
--- /dev/null
+++ b/content/browser/browser_message_filter_peer.cc
@@ -0,0 +1,53 @@
+// Copyright (c) 2014 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 "content/browser/browser_message_filter_peer.h"
+
+#include "base/command_line.h"
+#include "content/browser/browser_child_process_host_impl.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/common/result_codes.h"
+
+namespace content {
+
+BrowserMessageFilterPeer::BrowserMessageFilterPeer()
+    : pid_(base::kNullProcessId) {
+#if defined(OS_WIN)
+  handle_ = base::kNullProcessHandle;
+#endif
+}
+
+BrowserMessageFilterPeer::BrowserMessageFilterPeer(base::ProcessId pid)
+    : pid_(pid) {
+#if defined(OS_WIN)
+  handle_ = base::kNullProcessHandle;
+#endif
+}
+
+void BrowserMessageFilterPeer::BadMessageReceived() {
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kDisableKillAfterBadIPC))
+    return;
+
+  BrowserChildProcessHostImpl::HistogramBadMessageTerminated(
+      PROCESS_TYPE_RENDERER);
+  base::KillProcess(GetHandle(), content::RESULT_CODE_KILLED_BAD_MESSAGE,
+                    false);
+}
+
+base::ProcessHandle BrowserMessageFilterPeer::GetHandle() {
+#if defined(OS_WIN)
+  base::AutoLock lock(handle_lock_);
+  if (handle_ == base::kNullProcessHandle)
+    base::OpenPrivilegedProcessHandle(pid_, &handle_);
+
+  return handle_;
+#else
+  base::ProcessHandle result = base::kNullProcessHandle;
+  base::OpenPrivilegedProcessHandle(pid_, &result);
+  return result;
+#endif
+}
+
+}  // namespace content