Add metal view, shaders and renderer.

webrtc/sdk/BUILD.gn

Index: webrtc/sdk/BUILD.gn
diff --git a/webrtc/sdk/BUILD.gn b/webrtc/sdk/BUILD.gn
index 3e44f9b4a33c4a3d569369e970f9a16056e8e707..c62b22d174078e73787a70630747357c33b67f4e 100644
--- a/webrtc/sdk/BUILD.gn
+++ b/webrtc/sdk/BUILD.gn
@@ -67,7 +67,22 @@ if (is_ios || is_mac) {
         "objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h",
         "objc/Framework/Headers/WebRTC/UIDevice+RTCDevice.h",
       ]
+      if (current_cpu == "arm64") {
+        sources += [
+          "objc/Framework/Classes/metal/RTCMTLVideoView.m",
+          "objc/Framework/Classes/metal/RTCNV12Renderer.h",
+          "objc/Framework/Classes/metal/RTCNV12Renderer.mm",
+        ]
+      }
+
       libs = [ "AVFoundation.framework" ]
+      if (current_cpu == "arm64") {
+        libs += [
+          "CoreVideo.framework",
+          "Metal.framework",
+          "MetalKit.framework",
+        ]
+      }
     }
     if (!build_with_chromium) {
       sources += [
@@ -291,6 +306,8 @@ if (is_ios || is_mac) {
         "objc/Framework/Headers/WebRTC/RTCMediaStreamTrack.h",
         "objc/Framework/Headers/WebRTC/RTCMetrics.h",
         "objc/Framework/Headers/WebRTC/RTCMetricsSampleInfo.h",
+        "objc/Framework/Headers/WebRTC/RTCMTLVideoView.h",
+        "objc/Framework/Headers/WebRTC/RTCMTLRenderer.h",
         "objc/Framework/Headers/WebRTC/RTCPeerConnection.h",
         "objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h",
         "objc/Framework/Headers/WebRTC/RTCRtpCodecParameters.h",