Refactor: Make MediaCaptureDevicesDispatcher have pluggable handlers.

chrome/browser/media/media_access_handler.h

+// 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_MEDIA_ACCESS_HANDLER_H_
+#define CHROME_BROWSER_MEDIA_MEDIA_ACCESS_HANDLER_H_
+
+#include <deque>
+#include <map>

[Sergey Ulanov, 2015/05/07 01:05:48]

remove these two includes. They are not used in this header.

[changbin, 2015/05/22 05:10:58]

Done.

+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"

[Sergey Ulanov, 2015/05/07 01:05:48]

Remove these two includes.

[changbin, 2015/05/22 05:10:58]

content::MediaResponseCallback is actually base::Callback. While I don't know
how to forward-declare base::Callback here?

+#include "content/public/common/media_stream_request.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace extensions {
+class Extension;
+}
+
+// Interface for handling media access requests that are propagated from
+// MediaCaptureDevicesDispatcher.
+class MediaAccessHandler {
+ public:
+  MediaAccessHandler() {}
+  virtual ~MediaAccessHandler() {}
+
+  virtual bool SupportsRequest(const content::MediaStreamRequest& request,
+                               const extensions::Extension* extension) = 0;
+  virtual void HandleRequest(content::WebContents* web_contents,
+                             const content::MediaStreamRequest& request,
+                             const content::MediaResponseCallback& callback,
+                             const extensions::Extension* extension) = 0;
+};
+
+#endif  // CHROME_BROWSER_MEDIA_MEDIA_ACCESS_HANDLER_H_