This CL adds RTCMTLVideoView.h and RTCCameraVideoCapturer.h to WebRTC.h
in order to fix a build issue that comes up when using WebRTC.framework from swift code.

BUG=webrtc:7488

Review-Url: https://codereview.webrtc.org/2832803002
Cr-Commit-Position: refs/heads/master@{#17909}
diff --git a/webrtc/sdk/BUILD.gn b/webrtc/sdk/BUILD.gn
index 89de28c..8c8cade 100644
--- a/webrtc/sdk/BUILD.gn
+++ b/webrtc/sdk/BUILD.gn
@@ -323,6 +323,7 @@
         "objc/Framework/Headers/WebRTC/RTCAVFoundationVideoSource.h",
         "objc/Framework/Headers/WebRTC/RTCAudioSource.h",
         "objc/Framework/Headers/WebRTC/RTCAudioTrack.h",
+        "objc/Framework/Headers/WebRTC/RTCCameraVideoCapturer.h",
         "objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h",
         "objc/Framework/Headers/WebRTC/RTCConfiguration.h",
         "objc/Framework/Headers/WebRTC/RTCDataChannel.h",
@@ -352,6 +353,7 @@
         "objc/Framework/Headers/WebRTC/RTCSSLAdapter.h",
         "objc/Framework/Headers/WebRTC/RTCSessionDescription.h",
         "objc/Framework/Headers/WebRTC/RTCTracing.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoCapturer.h",
         "objc/Framework/Headers/WebRTC/RTCVideoFrame.h",
         "objc/Framework/Headers/WebRTC/RTCVideoRenderer.h",
         "objc/Framework/Headers/WebRTC/RTCVideoSource.h",