Add IPC benchmarking API to Blink TestRunner

content/shell/browser/ipc_echo_message_filter.cc

Index: content/shell/browser/ipc_echo_message_filter.cc
diff --git a/content/shell/browser/ipc_echo_message_filter.cc b/content/shell/browser/ipc_echo_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d3837894b6790118f8c58084321a34cc0792c2aa
--- /dev/null
+++ b/content/shell/browser/ipc_echo_message_filter.cc
@@ -0,0 +1,33 @@
+// 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 "content/shell/browser/ipc_echo_message_filter.h"
+
+#include "content/shell/common/shell_messages.h"
+
+namespace content {
+
+IPCEchoMessageFilter::IPCEchoMessageFilter()
+    : BrowserMessageFilter(ShellMsgStart) {
+}
+
+IPCEchoMessageFilter::~IPCEchoMessageFilter() {
+}
+
+bool IPCEchoMessageFilter::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(IPCEchoMessageFilter, message)
+    IPC_MESSAGE_HANDLER(ShellViewHostMsg_EchoPing, OnEchoPing)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  return handled;
+}
+
+void IPCEchoMessageFilter::OnEchoPing(int routing_id, int id,
+                                    const std::string& body) {
+  Send(new ShellViewMsg_EchoPong(routing_id, id, body));
+}
+
+}  // namespace content