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..dfc60fd685ac8eec61e0905650e119c4450e0340
--- /dev/null
+++ b/media/video/capture/screen/screen_capture_device.h
@@ -0,0 +1,51 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.

[Wez, 2013/01/31 00:15:29]

Drop (c), and year is 2013.

Welcome to the future(c).

[Sergey Ulanov, 2013/01/31 02:05:43]

Why?
I started this CL in 2012. Besides, CQ should update it if necessary.

Please don't nit on the copyright headers. It's waste of time for everybody. We
have presubmit check for this.

[Wez, 2013/02/01 00:44:34]

From the chromium-dev@ thread:

"In related news, the “(c)” will be being dropped from the notice line..."

Q: "If one has a CL they carried over from 2012, they should update the
copyright to 2013 for new files in that CL, right?"
A: "Right."

IIUC you're right and the CQ should catch the year, yes.

[Sergey Ulanov, 2013/02/01 02:02:26]

Ah, I haven't seen this e-mail. It says that (c) is acceptable until it is
removed from all files, and it hasn't been removed, so I guess I can keep it.
Looks like it didn't do it. Will fix it in a separate CL.

+// 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 screen. It's

[Wez, 2013/01/31 00:15:29]

nit: screen -> the screen

[Sergey Ulanov, 2013/01/31 02:05:43]

Done.

+// essentially an adapter between ScreenCapturer and VideoCaptureDevice.
+class MEDIA_EXPORT ScreenCaptureDevice : public VideoCaptureDevice {
+ public:
+  ScreenCaptureDevice(scoped_refptr<base::SequencedTaskRunner> task_runner);

[Wez, 2013/01/31 00:15:29]

explicit

[Sergey Ulanov, 2013/01/31 02:05:43]

Done.

+  virtual ~ScreenCaptureDevice();
+
+  // Helper used in tests to supply a fake capturer.
+  void set_test_screen_capturer(

[Wez, 2013/01/31 00:15:29]

nit: SetScreenCapturerForTest() would read more naturally.

[Sergey Ulanov, 2013/01/31 02:05:43]

Done.

+      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_