Revert of Delete video_render module.

webrtc/modules/video_render/ios/video_render_ios_gles20.h

Index: webrtc/modules/video_render/ios/video_render_ios_gles20.h
diff --git a/webrtc/modules/video_render/ios/video_render_ios_gles20.h b/webrtc/modules/video_render/ios/video_render_ios_gles20.h
new file mode 100644
index 0000000000000000000000000000000000000000..d4e04e79d7374559a1195c3daa113c4a74557a45
--- /dev/null
+++ b/webrtc/modules/video_render/ios/video_render_ios_gles20.h
@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2013 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_MODULES_VIDEO_RENDER_IOS_VIDEO_RENDER_IOS_GLES20_H_
+#define WEBRTC_MODULES_VIDEO_RENDER_IOS_VIDEO_RENDER_IOS_GLES20_H_
+
+#include <list>
+#include <map>
+#include <memory>
+
+#include "webrtc/base/platform_thread.h"
+#include "webrtc/modules/video_render/ios/video_render_ios_channel.h"
+#include "webrtc/modules/video_render/ios/video_render_ios_view.h"
+
+namespace webrtc {
+
+class CriticalSectionWrapper;
+class EventTimerWrapper;
+
+class VideoRenderIosGles20 {
+ public:
+  VideoRenderIosGles20(VideoRenderIosView* view,
+                       bool full_screen,
+                       int render_id);
+  virtual ~VideoRenderIosGles20();
+
+  int Init();
+  VideoRenderIosChannel* CreateEaglChannel(int channel,
+                                           int z_order,
+                                           float left,
+                                           float top,
+                                           float right,
+                                           float bottom);
+  int DeleteEaglChannel(int channel);
+  bool HasChannel(int channel);
+  bool ScreenUpdateProcess();
+  int GetWindowRect(Rect& rect);  // NOLINT
+
+  int GetScreenResolution(uint& screen_width, uint& screen_height);  // NOLINT
+  int SetStreamCropping(const uint stream_id,
+                        const float left,
+                        const float top,
+                        const float right,
+                        const float bottom);
+
+  int ChangeWindow(void* new_window);
+  int StartRender();
+  int StopRender();
+
+ protected:
+  static bool ScreenUpdateThreadProc(void* obj);
+
+ private:
+  bool RenderOffScreenBuffers();
+  int SwapAndDisplayBuffers();
+
+ private:
+  std::unique_ptr<CriticalSectionWrapper> gles_crit_sec_;
+  EventTimerWrapper* screen_update_event_;
+  // TODO(pbos): Remove unique_ptr and use member directly.
+  std::unique_ptr<rtc::PlatformThread> screen_update_thread_;
+
+  VideoRenderIosView* view_;
+  Rect window_rect_;
+  int window_width_;
+  int window_height_;
+  bool is_full_screen_;
+  GLint backing_width_;
+  GLint backing_height_;
+  GLuint view_renderbuffer_;
+  GLuint view_framebuffer_;
+  GLuint depth_renderbuffer_;
+  std::map<int, VideoRenderIosChannel*> agl_channels_;
+  std::multimap<int, int> z_order_to_channel_;
+  EAGLContext* gles_context_;
+  bool is_rendering_;
+};
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_RENDER_IOS_VIDEO_RENDER_IOS_GLES20_H_