Refactor: Make MediaCaptureDevicesDispatcher have pluggable handlers.

chrome/browser/media/media_access_handler.h

+// Copyright (c) 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>
+
+#include "content/public/browser/web_contents.h"

[Sergey Ulanov, 2015/04/24 22:43:51]

WebContents can be forward-declared

[changbin, 2015/04/29 05:24:34]

Done.

+#include "content/public/common/media_stream_request.h"
+
+namespace extensions {
+class Extension;
+}
+
+class MediaAccessHandler {

[Sergey Ulanov, 2015/04/24 22:43:51]

Add comments to explain what this interface is used for.

[changbin, 2015/04/29 05:24:34]

Done.

+ public:
+  MediaAccessHandler();
+  virtual ~MediaAccessHandler();
+
+  virtual void HandleRequest(content::WebContents* web_contents,
+                             const content::MediaStreamRequest& request,
+                             const content::MediaResponseCallback& callback,
+                             const extensions::Extension* extension) = 0;
+};
+
+struct PendingAccessRequest {

[Sergey Ulanov, 2015/04/24 22:43:51]

This doesn't need to be in this header - they are useful only in some
implementations of MediaAccessHandler. Move to RegularMediaAccessHandler?

[changbin, 2015/04/29 05:24:34]

Thanks, done. PTAL

+  PendingAccessRequest(const content::MediaStreamRequest& request,
+                       const content::MediaResponseCallback& callback);
+  ~PendingAccessRequest();
+
+  // TODO(gbillock): make the MediaStreamDevicesController owned by
+  // this object when we're using bubbles.
+  content::MediaStreamRequest request;
+  content::MediaResponseCallback callback;
+};
+
+typedef std::deque<PendingAccessRequest> RequestsQueue;
+typedef std::map<content::WebContents*, RequestsQueue> RequestsQueues;
+
+#endif  // CHROME_BROWSER_MEDIA_MEDIA_ACCESS_HANDLER_H_