Reland of Split iOS sdk in to separate targets

webrtc/sdk/objc/Framework/Classes/RTCShader+Private.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 "RTCShader.h"
-
-#import "WebRTC/RTCMacros.h"
-#import "WebRTC/RTCVideoFrame.h"
-
-#if TARGET_OS_IPHONE
-#import <OpenGLES/ES3/gl.h>
-#else
-#import <OpenGL/gl3.h>
-#endif
-
-RTC_EXTERN const char kRTCVertexShaderSource[];
-
-RTC_EXTERN GLuint RTCCreateShader(GLenum type, const GLchar *source);
-RTC_EXTERN GLuint RTCCreateProgram(GLuint vertexShader, GLuint fragmentShader);
-RTC_EXTERN GLuint RTCCreateProgramFromFragmentSource(const char fragmentShaderSource[]);
-RTC_EXTERN BOOL RTCSetupVerticesForProgram(
-    GLuint program, GLuint* vertexBuffer, GLuint* vertexArray);
-RTC_EXTERN void RTCSetVertexData(RTCVideoRotation rotation);