[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
new file mode 100644
index 0000000000000000000000000000000000000000..78c67d3a9f3876a8091228b5397813480a05933c
--- /dev/null
+++ b/chrome/browser/media/router/render_frame_host_helper.h
@@ -0,0 +1,16 @@
+// 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>
+
+namespace media_router {
+
+using RenderFrameHostId = std::pair<int, int>;

[miu, 2015/09/17 00:09:20]

nit: Although they're likely always to be int's, it is documentative to define
this as:

using RenderFrameHostId =
    std::pair<decltype(content::RenderProcessHost::GetID()),
              decltype(content::RenderFrameHost::GetRoutingID())>;

[imcheng, 2015/09/26 01:21:57]

Done. Since these are member functions it ends up being slightly more verbose
but I think it's ok.

+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_RENDER_FRAME_HOST_HELPER_H_