[Presentation API] 1-UA presentation support + presenter APIs.

chrome/browser/media/router/render_frame_host_helper.h

Index: chrome/browser/media/router/render_frame_host_helper.h
diff --git a/chrome/browser/media/router/render_frame_host_helper.h b/chrome/browser/media/router/render_frame_host_helper.h
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+// Copyright 2015 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 CHROME_BROWSER_MEDIA_ROUTER_RENDER_FRAME_HOST_HELPER_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_RENDER_FRAME_HOST_HELPER_H_
+
+#include <utility>
+
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_process_host.h"
+
+namespace media_router {
+
+using RenderFrameHostId =
+    std::pair<decltype(((content::RenderProcessHost*)nullptr)->GetID()),
+              decltype(((content::RenderFrameHost*)nullptr)->GetRoutingID())>;
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_RENDER_FRAME_HOST_HELPER_H_