content: Split out VideoCaptureMachine from DesktopCaptureDeviceAura

content/browser/media/capture/desktop_capture_device_aura.h

 // Copyright 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 CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_AURA_H_
 #define CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_AURA_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/desktop_media_id.h"
 #include "media/video/capture/video_capture_device.h"
 
 namespace aura {
 class Window;
 }  // namespace aura
 
 namespace content {
 
 class ContentVideoCaptureDeviceCore;
+class AuraWindowCaptureMachine;
 
 // An implementation of VideoCaptureDevice that mirrors an Aura window.
 class CONTENT_EXPORT DesktopCaptureDeviceAura
-    : public media::VideoCaptureDevice {
+    : public media::VideoCaptureDevice,
+      public base::SupportsWeakPtr<DesktopCaptureDeviceAura> {

[Sergey Ulanov, 2015/03/04 01:54:03]

Please use WeakPtrFactory<> as a member instead of inheriting from
SupportsWeakPtr<>. But you don't need weak pointers here at all - see my
comments in .cc

  public:
   // Creates a VideoCaptureDevice for the Aura desktop.
   static media::VideoCaptureDevice* Create(const DesktopMediaID& source);
 
   ~DesktopCaptureDeviceAura() override;
 
   // VideoCaptureDevice implementation.
   void AllocateAndStart(const media::VideoCaptureParams& params,
                         scoped_ptr<Client> client) override;
   void StopAndDeAllocate() override;
 
  private:
-  DesktopCaptureDeviceAura(const DesktopMediaID& source);
+  DesktopCaptureDeviceAura();
+  void SetWindow(const DesktopMediaID& source);
 
+  // machine_ is owned by core_.
+  AuraWindowCaptureMachine* machine_;
   const scoped_ptr<class ContentVideoCaptureDeviceCore> core_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopCaptureDeviceAura);
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_CAPTURE_DESKTOP_CAPTURE_DEVICE_AURA_H_