Obj-C SDK Cleanup

This CL separates the files under sdk/objc into logical directories, replacing
the previous file layout under Framework/.

A long term goal is to have some system set up to generate the files under
sdk/objc/api (the PeerConnection API wrappers) from the C++ code. In the shorter
term the goal is to abstract out shared concepts from these classes in order to
make them as uniform as possible.

The separation into base/, components/, and helpers/ are to differentiate between
the base layer's common protocols, various utilities and the actual platform
specific components.

The old directory layout that resembled a framework's internal layout is not
necessary, since it is generated by the framework target when building it.

Bug: webrtc:9627
Change-Id: Ib084fd83f050ae980649ca99e841f4fb0580bd8f
Reviewed-on: https://webrtc-review.googlesource.com/94142
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24493}
diff --git a/sdk/objc/Framework/Headers/WebRTC/RTCVideoViewShading.h b/sdk/objc/Framework/Headers/WebRTC/RTCVideoViewShading.h
index 6f3ece9..7c6cd7a 100644
--- a/sdk/objc/Framework/Headers/WebRTC/RTCVideoViewShading.h
+++ b/sdk/objc/Framework/Headers/WebRTC/RTCVideoViewShading.h
@@ -8,34 +8,4 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#import <Foundation/Foundation.h>
-
-#import <WebRTC/RTCVideoFrame.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-/**
- * RTCVideoViewShading provides a way for apps to customize the OpenGL(ES) shaders used in
- * rendering for the RTCEAGLVideoView/RTCNSGLVideoView.
- */
-RTC_EXPORT
-@protocol RTCVideoViewShading <NSObject>
-
-/** Callback for I420 frames. Each plane is given as a texture. */
-- (void)applyShadingForFrameWithWidth:(int)width
-                               height:(int)height
-                             rotation:(RTCVideoRotation)rotation
-                               yPlane:(GLuint)yPlane
-                               uPlane:(GLuint)uPlane
-                               vPlane:(GLuint)vPlane;
-
-/** Callback for NV12 frames. Each plane is given as a texture. */
-- (void)applyShadingForFrameWithWidth:(int)width
-                               height:(int)height
-                             rotation:(RTCVideoRotation)rotation
-                               yPlane:(GLuint)yPlane
-                              uvPlane:(GLuint)uvPlane;
-
-@end
-
-NS_ASSUME_NONNULL_END
+#import "components/renderer/opengl/RTCVideoViewShading.h"