Add scroll perf test for protocol in chromoting

remoting/test/scroll_frame_generator.h

Index: remoting/test/scroll_frame_generator.h
diff --git a/remoting/test/scroll_frame_generator.h b/remoting/test/scroll_frame_generator.h
new file mode 100644
index 0000000000000000000000000000000000000000..762ad7bd0c19dcf80cbd9c2f7d8b66d6f4e6505a
--- /dev/null
+++ b/remoting/test/scroll_frame_generator.h
@@ -0,0 +1,46 @@
+// Copyright 2016 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 REMOTING_TEST_SCROLL_FRAME_GENERATOR_H_
+#define REMOTING_TEST_SCROLL_FRAME_GENERATOR_H_
+
+#include <memory>
+#include <unordered_map>
+
+#include "base/memory/ref_counted.h"
+#include "base/time/time.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_capturer.h"
+
+namespace remoting {
+namespace test {
+
+class ScrollFrameGenerator
+    : public base::RefCountedThreadSafe<ScrollFrameGenerator> {
+ public:
+  ScrollFrameGenerator();
+
+  std::unique_ptr<webrtc::DesktopFrame> GenerateFrame(
+      webrtc::SharedMemoryFactory* shared_memory_factory);
+
+  base::TimeDelta GetFrameLatency(const webrtc::DesktopFrame& frame);
+
+ private:
+  ~ScrollFrameGenerator();
+  friend class base::RefCountedThreadSafe<ScrollFrameGenerator>;
+
+  std::unique_ptr<webrtc::DesktopFrame> base_frame_;
+  base::TimeTicks start_time_;
+
+  std::unordered_map<int, base::TimeTicks> frame_timestamp_;
+
+  // Id of the last frame encoded on the barcode.
+  int last_frame_id_ = -1;
+
+  DISALLOW_COPY_AND_ASSIGN(ScrollFrameGenerator);
+};
+
+}  // namespace test
+}  // namespace remoting
+
+#endif  // REMOTING_TEST_SCROLL_FRAME_GENERATOR_H_