Add IPC benchmarking API to Blink TestRunner

content/shell/renderer/ipc_echo.h

Index: content/shell/renderer/ipc_echo.h
diff --git a/content/shell/renderer/ipc_echo.h b/content/shell/renderer/ipc_echo.h
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+++ b/content/shell/renderer/ipc_echo.h
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+// Copyright 2013 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.
+
+#ifndef CONTENT_SHELL_IPC_ECHO_H_
+#define CONTENT_SHELL_IPC_ECHO_H_
+
+#include <utility>
+#include <vector>
+#include "base/compiler_specific.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+
+namespace IPC {
+class Sender;
+}
+
+namespace content {
+
+// This class is for writing micro benchmarks exercising underlying
+// IPC::Channel using HTML and JavaScript.
+//
+// TODO(morrita): The benchmark effort tries to makesure that
+// IPC::ChannelMojo is as performant as native IPC::Channel
+// implementations. Currently IPC::ChannelMojo is hidden behind
+// "--enable-renderer-mojo-channel". Once it is turned on by default.
+// we no longer need this class and should remove it.
+class IPCEcho {
+ public:
+  IPCEcho(blink::WebDocument document, IPC::Sender* sender, int routing_id);
+
+  void RequestEcho(int id, int size);
+  void DidRespondEcho(int id, int size);
+
+  int last_echo_id() const { return last_echo_id_; }
+  int last_echo_size() const { return last_echo_size_; }
+
+  blink::WebDocument document_;
+  IPC::Sender* sender_;
+  int routing_id_;
+  int last_echo_id_;
+  int last_echo_size_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_SHELL_IPC_ECHO_DISPATCHER_H_