Copy RTCAudioSource.h and RTCMediaSource.h with other public header files when building the WebRTC framework for iOS / Mac

NOTRY=True

Review-Url: https://codereview.webrtc.org/2313473002
Cr-Commit-Position: refs/heads/master@{#14117}
diff --git a/AUTHORS b/AUTHORS
index 6d1ee96..729f804 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -33,6 +33,7 @@
 Saul Kravitz <Saul.Kravitz@celera.com>
 Silviu Caragea <silviu.cpp@gmail.com>
 Steve Reid <sreid@sea-to-sky.net>
+Vladimir Beloborodov <VladimirTechMan@gmail.com>
 Vicken Simonian <vsimon@gmail.com>
 Victor Costan <costan@gmail.com>
 
diff --git a/webrtc/sdk/sdk.gyp b/webrtc/sdk/sdk.gyp
index 1aae9c5..d6eaa1e 100644
--- a/webrtc/sdk/sdk.gyp
+++ b/webrtc/sdk/sdk.gyp
@@ -255,6 +255,7 @@
             'objc/Framework/Modules/module.modulemap',
           ],
           'mac_framework_headers': [
+            'objc/Framework/Headers/WebRTC/RTCAudioSource.h',
             'objc/Framework/Headers/WebRTC/RTCAudioTrack.h',
             'objc/Framework/Headers/WebRTC/RTCAVFoundationVideoSource.h',
             'objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h',
@@ -270,6 +271,7 @@
             'objc/Framework/Headers/WebRTC/RTCLogging.h',
             'objc/Framework/Headers/WebRTC/RTCMacros.h',
             'objc/Framework/Headers/WebRTC/RTCMediaConstraints.h',
+            'objc/Framework/Headers/WebRTC/RTCMediaSource.h',
             'objc/Framework/Headers/WebRTC/RTCMediaStream.h',
             'objc/Framework/Headers/WebRTC/RTCMediaStreamTrack.h',
             'objc/Framework/Headers/WebRTC/RTCMetrics.h',