ObjC: Split out I420 texture uploading into separate class

webrtc/sdk/objc/Framework/Classes/RTCOpenGLDefines.h

 /*
  *  Copyright 2016 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.
  */
 
+#import <Foundation/Foundation.h>
+
 #if TARGET_OS_IPHONE
 #define RTC_PIXEL_FORMAT GL_LUMINANCE
 #define SHADER_VERSION
 #define VERTEX_SHADER_IN "attribute"
 #define VERTEX_SHADER_OUT "varying"
 #define FRAGMENT_SHADER_IN "varying"
 #define FRAGMENT_SHADER_OUT
 #define FRAGMENT_SHADER_COLOR "gl_FragColor"
 #define FRAGMENT_SHADER_TEXTURE "texture2D"
 
 @class EAGLContext;
 typedef EAGLContext GlContextType;
 #else
 #define RTC_PIXEL_FORMAT GL_RED
 #define SHADER_VERSION "#version 150\n"
 #define VERTEX_SHADER_IN "in"
 #define VERTEX_SHADER_OUT "out"
 #define FRAGMENT_SHADER_IN "in"
 #define FRAGMENT_SHADER_OUT "out vec4 fragColor;\n"
 #define FRAGMENT_SHADER_COLOR "fragColor"
 #define FRAGMENT_SHADER_TEXTURE "texture"
 
 @class NSOpenGLContext;
 typedef NSOpenGLContext GlContextType;
 #endif