Add a base class for objects that want to filter messages on the UI thread. ...

chrome/browser/browser_io_message_filter.cc

+// Copyright (c) 2010 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 "chrome/browser/browser_io_message_filter.h"
+
+#include "base/logging.h"
+#include "base/process_util.h"
+
+BrowserIOMessageFilter::BrowserIOMessageFilter() : channel_(NULL) {
+}
+
+BrowserIOMessageFilter::~BrowserIOMessageFilter() {
+}
+
+void BrowserIOMessageFilter::OnFilterAdded(IPC::Channel* channel) {
+  channel_ = channel;
+}
+
+void BrowserIOMessageFilter::OnChannelClosing() {
+  channel_ = NULL;
+}
+
+void BrowserIOMessageFilter::OnChannelConnected(int32 peer_pid) {
+  if (!base::OpenProcessHandle(peer_pid, &peer_handle_)) {
+    NOTREACHED();
+  }
+}
+
+bool BrowserIOMessageFilter::Send(IPC::Message* msg) {
+  if (channel_)
+    return channel_->Send(msg);
+
+  delete msg;
+  return false;
+}