Implement Desktop Media Picker (Mac version) for Desktop Capture API

chrome/browser/ui/cocoa/media_picker/desktop_media_picker_bridge.h

+// Copyright (c) 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 CHROME_BROWSER_UI_COCOA_MEDIA_PICKER_DESKTOP_MEDIA_PICKER_BRIDGE_H_
+#define CHROME_BROWSER_UI_COCOA_MEDIA_PICKER_DESKTOP_MEDIA_PICKER_BRIDGE_H_
+
+#include "base/basictypes.h"
+#include "chrome/browser/media/desktop_media_picker_model.h"
+
+// Protocol corresponding to |DesktopMediaPickerModel::Observer|.
+@protocol DesktopMediaPickerObserver
+- (void)sourceAddedAtIndex:(int)index;
+- (void)sourceRemovedAtIndex:(int)index;
+- (void)sourceNameChangedAtIndex:(int)index;
+- (void)sourceThumbnailChangedAtIndex:(int)index;
+@end
+
+// Provides a |DesktopMediaPickerModel::Observer| implementation that forwards
+// notifications to a objective-c object implementing the
+// |DesktopMediaPickerObserver| protocol.
+class DesktopMediaPickerBridge : public DesktopMediaPickerModel::Observer {
+ public:
+  DesktopMediaPickerBridge(id<DesktopMediaPickerObserver> observer);
+  virtual ~DesktopMediaPickerBridge();
+
+  // DesktopMediaPickerModel::Observer overrides
+  virtual void OnSourceAdded(int index) OVERRIDE;
+  virtual void OnSourceRemoved(int index) OVERRIDE;
+  virtual void OnSourceNameChanged(int index) OVERRIDE;
+  virtual void OnSourceThumbnailChanged(int index) OVERRIDE;
+
+ private:
+  id<DesktopMediaPickerObserver> observer_;  // weak; owns this
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopMediaPickerBridge);
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_MEDIA_PICKER_DESKTOP_MEDIA_PICKER_BRIDGE_H_