Implement Chrome Extension TabCapture API.

chrome/browser/extensions/api/tab_capture/tab_capture_event_router.h

+// Copyright (c) 2012 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_EXTENSIONS_API_TAB_CAPTURE_TAB_CAPTURE_EVENT_ROUTER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_TAB_CAPTURE_TAB_CAPTURE_EVENT_ROUTER_H_
+
+#include <map>
+
+#include "base/string16.h"
+#include "chrome/browser/media/media_internals.h"
+#include "chrome/browser/media/media_internals_observer.h"
+#include "chrome/common/extensions/api/experimental_tab_capture.h"
+#include "content/public/common/media_stream_request.h"
+
+class Profile;
+
+namespace extensions {
+
+namespace tab_capture = extensions::api::experimental_tab_capture;
+
+class TabCaptureEventRouter : public MediaInternalsObserver {

[Aaron Boodman, 2012/10/04 07:21:43]

You will be the first to do this (sorry), but can we try making this class a
ProfileKeyedService that depends on ExtensionSystem? I would like to better
decouple clients of the extension system from the system itself.

[justinlin, 2012/10/08 09:58:31]

Done.

+ public:
+  explicit TabCaptureEventRouter(Profile* profile);
+  virtual ~TabCaptureEventRouter();
+
+  std::map<int, tab_capture::TabCaptureState> GetCapturedTabs();

[Alpha Left Google, 2012/10/04 20:52:01]

Use a typedef for this map.

[justinlin, 2012/10/08 09:58:31]

Done.

+
+ private:
+  // MediaInternalsObserver.
+  virtual void OnRequestUpdate(
+      const content::MediaStreamDevice& device,
+      const content::MediaStreamRequest::RequestState state) OVERRIDE;
+
+  void HandleRequestUpdate(
+      const content::MediaStreamDevice& device,
+      const content::MediaStreamRequest::RequestState state);
+
+  Profile* const profile_;
+  std::map<int, tab_capture::TabCaptureState> requests_;

[Alpha Left Google, 2012/10/04 20:52:01]

Use typedef.

[justinlin, 2012/10/08 09:58:31]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(TabCaptureEventRouter);
+};
+
+}  // namespace extension
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_TAB_CAPTURE_TAB_CAPTURE_EVENT_ROUTER_H_