Implement screen capturer for MediaStream API.

media/video/capture/screen/screen_capture_device.h

Index: media/video/capture/screen/screen_capture_device.h
diff --git a/media/video/capture/screen/screen_capture_device.h b/media/video/capture/screen/screen_capture_device.h
new file mode 100644
index 0000000000000000000000000000000000000000..3b7aa5ed39593fc94eb53b8a711def66826091b7
--- /dev/null
+++ b/media/video/capture/screen/screen_capture_device.h
@@ -0,0 +1,52 @@
+// 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_SCREEN_CAPTURER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_SCREEN_CAPTURER_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/base/media_export.h"
+#include "media/video/capture/screen/screen_capturer.h"
+#include "media/video/capture/video_capture_device.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace base {
+class SequencedTaskRunner;
+}  // namespace base
+
+namespace media {
+
+// ScreenCaptureDevice implements VideoCaptureDevice for the screen. It's
+// essentially an adapter between ScreenCapturer and VideoCaptureDevice.
+class MEDIA_EXPORT ScreenCaptureDevice : public VideoCaptureDevice {
+ public:
+  explicit ScreenCaptureDevice(
+      scoped_refptr<base::SequencedTaskRunner> task_runner);
+  virtual ~ScreenCaptureDevice();
+
+  // Helper used in tests to supply a fake capturer.
+  void SetScreenCapturerForTest(
+      scoped_ptr<media::ScreenCapturer> capturer);
+
+  // VideoCaptureDevice interface.
+  virtual void Allocate(int width, int height,
+                        int frame_rate,
+                        EventHandler* event_handler) OVERRIDE;
+  virtual void Start() OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void DeAllocate() OVERRIDE;
+  virtual const Name& device_name() OVERRIDE;
+
+ private:
+  class Core;
+  scoped_refptr<Core> core_;
+  Name name_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenCaptureDevice);
+};
+
+}  // namespace media
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_SCREEN_CAPTURER_H_