Revert of Remove ignored return code from modules.

webrtc/modules/video_render/video_render_impl.h

 /*
  *  Copyright (c) 2011 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.
  */
 
@@ skipping 17 matching lines @@
     /*
      *   VideoRenderer constructor/destructor
      */
     ModuleVideoRenderImpl(const int32_t id,
                           const VideoRenderType videoRenderType,
                           void* window, const bool fullscreen);
 
     virtual ~ModuleVideoRenderImpl();
 
     virtual int64_t TimeUntilNextProcess();
-    virtual void Process();
+    virtual int32_t Process();
 
     /*
      *   Returns the render window
      */
     virtual void* Window();
 
     /*
      *   Change render window
      */
     virtual int32_t ChangeWindow(void* window);
@@ skipping 157 matching lines @@
     bool _fullScreen;
 
     IVideoRender* _ptrRenderer;
     typedef std::map<uint32_t, IncomingVideoStream*> IncomingVideoStreamMap;
     IncomingVideoStreamMap _streamRenderMap;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_RENDER_MAIN_SOURCE_VIDEO_RENDER_IMPL_H_