Add support for a virtual display on ChromeOS

content/browser/media/capture/virtual_display_capturer.h

Index: content/browser/media/capture/virtual_display_capturer.h
diff --git a/content/browser/media/capture/virtual_display_capturer.h b/content/browser/media/capture/virtual_display_capturer.h
new file mode 100644
index 0000000000000000000000000000000000000000..a93a2487c47f2da15fe0b6efe7f629e4f8c1c426
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+++ b/content/browser/media/capture/virtual_display_capturer.h
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+// 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 CONTENT_BROWSER_MEDIA_CAPTURE_VIRTUAL_DISPLAY_CAPTURER_H_
+#define CONTENT_BROWSER_MEDIA_CAPTURE_VIRTUAL_DISPLAY_CAPTURER_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/media/capture/aura_window_capture_machine.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/desktop_media_id.h"
+#include "media/video/capture/video_capture_device.h"
+#include "ui/gfx/display_observer.h"
+
+namespace aura {
+class Window;
+}  // namespace aura
+
+namespace content {
+
+class ContentVideoCaptureDeviceCore;
+
+class CONTENT_EXPORT VirtualDisplayCapturer : public media::VideoCaptureDevice,
+                                              public gfx::DisplayObserver {
+ public:
+  // Creates a VideoCaptureDevice for a virtual desktop.
+  static media::VideoCaptureDevice* Create(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      const DesktopMediaID& source);
+
+  ~VirtualDisplayCapturer() override;
+
+  // VideoCaptureDevice implementation.
+  void AllocateAndStart(const media::VideoCaptureParams& params,
+                        scoped_ptr<Client> client) override;
+  void StopAndDeAllocate() override;
+
+  // gfx::DisplayObserver overrides:
+  void OnDisplayAdded(const gfx::Display& display) override;
+  void OnDisplayRemoved(const gfx::Display& display) override {}
+  void OnDisplayMetricsChanged(const gfx::Display& display,
+                               uint32_t metrics) override {}
+
+ private:
+  VirtualDisplayCapturer(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      const DesktopMediaID& source);
+
+  DesktopMediaID source_;
+  AuraWindowCaptureMachine* machine_;
+  scoped_ptr<class ContentVideoCaptureDeviceCore> core_;
+  media::VideoCaptureParams params_;
+  scoped_ptr<Client> client_;
+  scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(VirtualDisplayCapturer);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_VIRTUAL_DISPLAY_CAPTURER_H_