Revert of Delete VideoFrameFactory, CapturedFrame, and related code.

webrtc/media/engine/webrtcvideoframefactory.h

+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAMEFACTORY_H_
+#define WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAMEFACTORY_H_
+
+#include "webrtc/media/base/videoframefactory.h"
+
+namespace cricket {
+
+struct CapturedFrame;
+
+// Creates instances of cricket::WebRtcVideoFrame.
+class WebRtcVideoFrameFactory : public VideoFrameFactory {
+ public:
+  // Note: Overriding a method name overrides all overloaded versions.
+  // Without this using-declaration, we would hide the 5-argument
+  // method we want to inherit.
+  using VideoFrameFactory::CreateAliasedFrame;
+
+  VideoFrame* CreateAliasedFrame(const CapturedFrame* aliased_frame,
+                                 int width,
+                                 int height) const override;
+};
+
+}  // namespace cricket
+
+#endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOFRAMEFACTORY_H_