Extend content::DesktopMediaID to allow Aura windows as capture sources.

content/public/browser/desktop_media_id.h

 // 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_PUBLIC_COMMON_DESKTOP_MEDIA_ID_H_
-#define CONTENT_PUBLIC_COMMON_DESKTOP_MEDIA_ID_H_
+#ifndef CONTENT_PUBLIC_BROWSER_DESKTOP_MEDIA_ID_H_
+#define CONTENT_PUBLIC_BROWSER_DESKTOP_MEDIA_ID_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "content/common/content_export.h"
 
+namespace aura {
+class Window;
+}  // namespace aura
+
 namespace content {
 
 // Type used to identify desktop media sources. It's converted to string and
 // stored in MediaStreamRequest::requested_video_device_id .
 struct CONTENT_EXPORT DesktopMediaID {
  public:
   enum Type {
     TYPE_NONE,
     TYPE_SCREEN,
     TYPE_WINDOW,
+    TYPE_AURA_WINDOW,
   };
   typedef intptr_t Id;
 
+  // Assigns integer identifier to the |window| and returns DesktopMediaID of
+  // type TYPE_AURA_WINDOW that corresponds to that |window|.
+  static DesktopMediaID RegisterAuraWindow(aura::Window* window);
+
+  // For DesktopMediaID of type TYPE_AURA_WINDOW returns the |window| that was
+  // previously registered using RegisterAuraWindow().
+  static aura::Window* GetAuraWindowById(const DesktopMediaID& id);
+
   static DesktopMediaID Parse(const std::string& str);
 
   DesktopMediaID()
       : type(TYPE_NONE),
         id(0) {
   }
   DesktopMediaID(Type type, Id id)
       : type(type),
         id(id) {
   }
 
   // Operators so that DesktopMediaID can be used with STL containers.
   bool operator<(const DesktopMediaID& other) const {
     return type < other.type || (type == other.type && id < other.id);
   }
   bool operator==(const DesktopMediaID& other) const {
     return type == other.type && id == other.id;
   }
 
   bool is_null() { return type == TYPE_NONE; }
 
   std::string ToString();
 
   Type type;
   Id id;
 };
 
 }  // namespace content
 
-#endif  // CONTENT_PUBLIC_COMMON_DESKTOP_MEDIA_ID_H_
+#endif  // CONTENT_PUBLIC_BROWSER_DESKTOP_MEDIA_ID_H_