Move IPC::MessageFilter and router to a separate file

There are no changes in implementation in this CL. This is in preparation
for making IPC::Channel support filters on the Channel's thread.

BUG=364241
TBR=cpu@chromium.org,nduca@chromium.org

cpu: OWNERS for win8
nduca: OWNERS for components/tracing

Review URL: https://codereview.chromium.org/245443005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266057 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 35 insertions, 0 deletions

diff --git a/ipc/message_filter.cc b/ipc/message_filter.cc
new file mode 100644
index 0000000..7218126
--- /dev/null
+++ b/ipc/message_filter.cc
@@ -0,0 +1,35 @@
+// Copyright 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 "ipc/message_filter.h"
+
+#include "base/memory/ref_counted.h"
+#include "ipc/ipc_channel.h"
+
+namespace IPC {
+
+MessageFilter::MessageFilter() {}
+
+void MessageFilter::OnFilterAdded(Channel* channel) {}
+
+void MessageFilter::OnFilterRemoved() {}
+
+void MessageFilter::OnChannelConnected(int32 peer_pid) {}
+
+void MessageFilter::OnChannelError() {}
+
+void MessageFilter::OnChannelClosing() {}
+
+bool MessageFilter::OnMessageReceived(const Message& message) {
+  return false;
+}
+
+bool MessageFilter::GetSupportedMessageClasses(
+    std::vector<uint32>* /*supported_message_classes*/) const {
+  return false;
+}
+
+MessageFilter::~MessageFilter() {}
+
+}  // namespace IPC