iOS render: Handle frame rotation in OpenGL

webrtc/sdk/objc/Framework/Classes/RTCShader+Private.h

Index: webrtc/sdk/objc/Framework/Classes/RTCShader+Private.h
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCShader+Private.h b/webrtc/sdk/objc/Framework/Classes/RTCShader+Private.h
index 0f277d4524a15fb7cc7770c608ad7cdeb19bee70..547d26235dc51047ad4caeed7bbe43dba9fdb963 100644
--- a/webrtc/sdk/objc/Framework/Classes/RTCShader+Private.h
+++ b/webrtc/sdk/objc/Framework/Classes/RTCShader+Private.h
@@ -18,6 +18,8 @@
 #import <OpenGL/gl3.h>
 #endif
 
+#include "webrtc/common_video/rotation.h"
+
 RTC_EXTERN const char kRTCVertexShaderSource[];
 
 RTC_EXTERN GLuint RTCCreateShader(GLenum type, const GLchar *source);
@@ -25,3 +27,4 @@ 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(webrtc::VideoRotation rotation);