These data structures support the Media Router Dialog webui.

chrome/browser/ui/webui/media_router/media_cast_mode.h

Index: chrome/browser/ui/webui/media_router/media_cast_mode.h
diff --git a/chrome/browser/ui/webui/media_router/media_cast_mode.h b/chrome/browser/ui/webui/media_router/media_cast_mode.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_UI_WEBUI_MEDIA_ROUTER_MEDIA_CAST_MODE_H_
+#define CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_CAST_MODE_H_
+
+#include <set>
+#include <string>
+
+namespace media_router {
+
+// A cast mode represents one way that the current WebContents (i.e., tab) may
+// be presented to a media sink.  These must be declared in the priority order
+// returned by GetPreferredCastMode.
+enum MediaCastMode {
+  // The default presentation for the WebContents.  Only available when the
+  // document has provided a default presentation URL.
+  DEFAULT,
+  // Capture the rendered WebContents and stream it to a media sink.  Always
+  // available.
+  TAB_MIRROR,
+  // Capture the entire desktop or a native application window and stream it to
+  // a media sink.  Always available.
+  DESKTOP_OR_WINDOW_MIRROR,
+  // Same as TAB_MIRROR, but capture at a reduced frame rate; suitable for
+  // static or audio-only content.  Always available.
+  SOUND_OPTIMIZED_TAB_MIRROR,
+  // The number of cast modes; not a valid cast mode.  Add new cast modes above.
+  NUM_CAST_MODES,
+};
+
+using CastModeSet = std::set<MediaCastMode>;
+
+// Returns a localized title string for |mode| and |host| (e.g. google.com).
+std::string MediaCastModeToTitle(MediaCastMode mode, const std::string& host);
+
+// Returns a localized description string for |mode| and |host|.
+std::string MediaCastModeToDescription(MediaCastMode mode,
+                                       const std::string& host);
+
+// Returns true if |cast_mode_num| is a valid MediaCastMode, false otherwise.
+bool IsValidCastModeNum(int cast_mode_num);
+
+// Returns the preferred cast mode from the current set of cast modes.
+// There must be at least one cast mode in |cast_modes|.
+MediaCastMode GetPreferredCastMode(const CastModeSet& cast_modes);
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_CAST_MODE_H_