iOS: Add interface for injecting custom shaders

webrtc/sdk/BUILD.gn

Index: webrtc/sdk/BUILD.gn
diff --git a/webrtc/sdk/BUILD.gn b/webrtc/sdk/BUILD.gn
index 9b41a1e59c5c625e1c6167706747431db77d38e1..3a377c29b0e1e73c96f28885ccbbf421c2768e63 100644
--- a/webrtc/sdk/BUILD.gn
+++ b/webrtc/sdk/BUILD.gn
@@ -83,11 +83,11 @@ if (is_ios || is_mac) {
     sources = [
       "objc/Framework/Classes/Video/RTCAVFoundationVideoCapturerInternal.h",
       "objc/Framework/Classes/Video/RTCAVFoundationVideoCapturerInternal.mm",
-      "objc/Framework/Classes/Video/RTCI420Shader.mm",
+      "objc/Framework/Classes/Video/RTCDefaultShader.h",
+      "objc/Framework/Classes/Video/RTCDefaultShader.mm",
       "objc/Framework/Classes/Video/RTCI420TextureCache.h",
       "objc/Framework/Classes/Video/RTCI420TextureCache.mm",
       "objc/Framework/Classes/Video/RTCOpenGLDefines.h",
-      "objc/Framework/Classes/Video/RTCShader+Private.h",
       "objc/Framework/Classes/Video/RTCShader.h",
       "objc/Framework/Classes/Video/RTCShader.mm",
       "objc/Framework/Classes/Video/avfoundationformatmapper.h",
@@ -102,7 +102,6 @@ if (is_ios || is_mac) {
       sources += [
         "objc/Framework/Classes/Video/RTCNV12TextureCache.h",
         "objc/Framework/Classes/Video/RTCNV12TextureCache.m",
-        "objc/Framework/Classes/Video/RTCNativeNV12Shader.mm",
       ]
       libs += [
         "GLKit.framework",
@@ -289,6 +288,7 @@ if (is_ios || is_mac) {
       "objc/Framework/Headers/WebRTC/RTCVideoRenderer.h",
       "objc/Framework/Headers/WebRTC/RTCVideoSource.h",
       "objc/Framework/Headers/WebRTC/RTCVideoTrack.h",
+      "objc/Framework/Headers/WebRTC/RTCVideoViewShading.h",
     ]
 
     libs = [ "AVFoundation.framework" ]
@@ -421,6 +421,7 @@ if (is_ios || is_mac) {
         "objc/Framework/Headers/WebRTC/RTCVideoRenderer.h",
         "objc/Framework/Headers/WebRTC/RTCVideoSource.h",
         "objc/Framework/Headers/WebRTC/RTCVideoTrack.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoViewShading.h",
         "objc/Framework/Headers/WebRTC/UIDevice+RTCDevice.h",
         "objc/Framework/Headers/WebRTC/WebRTC.h",
       ]