Revert "Remove placeholder Obj-C headers and use angle-bracketed headers."

This reverts commit 6bfad33.

Reason for revert: Breaks downstream project.

Original change's description:
> Remove placeholder Obj-C headers and use angle-bracketed headers.
>
> sdk/objc/Framework/Headers are just a placeholder headers
> for backward compatibility and I don't think it is really need this for now.
> Instead, we can generate the framework header in
> ios/mac_framework_bundle_with_umbrella_header.
> Also clang supports the -Wquoted-include-in-framework-header warning,
> and in Xcode 12, it's in Xcode's recommended settings. This warnings
> can be avoided by replacing double-quoted includes with angle-bracketed
> includes when generate framework headers.
>
> No-Presubmit: True
> Bug: webrtc:9627, webrtc:11984
> Change-Id: I3f6258dfa77a5acee669614005b2747feee35e39
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185920
> Commit-Queue: Anders Carlsson <[email protected]>
> Reviewed-by: Anders Carlsson <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#32343}

[email protected],[email protected],[email protected],[email protected]

Change-Id: I7a6f72ecb8feebf06ad0fe0ecef071da43b98fca
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9627
Bug: webrtc:11984
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/187160
Reviewed-by: Mirko Bonadei <[email protected]>
Commit-Queue: Mirko Bonadei <[email protected]>
Cr-Commit-Position: refs/heads/master@{#32344}

Author: MirkoBonadei

sdk/BUILD.gn

@@ -57,8 +57,8 @@ if (is_ios || is_mac) {
       # without pathname (so it works from within the framework module).
       "objc/base",
 
-      # Contains framework headers
-      "$target_gen_dir/WebRTC.framework",
+      # This is here for backward compatiblity reasons.
+      "objc/Framework/Headers",  # TODO(bugs.webrtc.org/9627): Remove this.
     ]
     cflags = [
       "-Wimplicit-retain-self",
@@ -950,6 +950,7 @@ if (is_ios || is_mac) {
         ":base_objc",
         ":file_logger_objc",
         ":helpers_objc",
+        ":legacy_header_paths",
         ":mediaconstraints_objc",
         ":mediasource_objc",
         ":native_api",
@@ -995,6 +996,90 @@ if (is_ios || is_mac) {
       }
     }
 
+    # TODO(bugs.webrtc.org/9627): Remove this target.
+    rtc_source_set("legacy_header_paths") {
+      sources = [
+        "objc/Framework/Classes/Common/NSString+StdString.h",
+        "objc/Framework/Classes/Common/scoped_cftyperef.h",
+        "objc/Framework/Classes/PeerConnection/RTCConfiguration+Native.h",
+        "objc/Framework/Classes/PeerConnection/RTCPeerConnectionFactory+Native.h",
+        "objc/Framework/Classes/Video/RTCDefaultShader.h",
+        "objc/Framework/Classes/Video/RTCNV12TextureCache.h",
+        "objc/Framework/Classes/VideoToolbox/nalu_rewriter.h",
+        "objc/Framework/Headers/WebRTC/RTCAudioSession.h",
+        "objc/Framework/Headers/WebRTC/RTCAudioSessionConfiguration.h",
+        "objc/Framework/Headers/WebRTC/RTCAudioSource.h",
+        "objc/Framework/Headers/WebRTC/RTCAudioTrack.h",
+        "objc/Framework/Headers/WebRTC/RTCCVPixelBuffer.h",
+        "objc/Framework/Headers/WebRTC/RTCCallbackLogger.h",
+        "objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h",
+        "objc/Framework/Headers/WebRTC/RTCCameraVideoCapturer.h",
+        "objc/Framework/Headers/WebRTC/RTCCertificate.h",
+        "objc/Framework/Headers/WebRTC/RTCConfiguration.h",
+        "objc/Framework/Headers/WebRTC/RTCDataChannel.h",
+        "objc/Framework/Headers/WebRTC/RTCDataChannelConfiguration.h",
+        "objc/Framework/Headers/WebRTC/RTCDefaultVideoDecoderFactory.h",
+        "objc/Framework/Headers/WebRTC/RTCDefaultVideoEncoderFactory.h",
+        "objc/Framework/Headers/WebRTC/RTCDispatcher.h",
+        "objc/Framework/Headers/WebRTC/RTCDtmfSender.h",
+        "objc/Framework/Headers/WebRTC/RTCEAGLVideoView.h",
+        "objc/Framework/Headers/WebRTC/RTCFieldTrials.h",
+        "objc/Framework/Headers/WebRTC/RTCFileLogger.h",
+        "objc/Framework/Headers/WebRTC/RTCFileVideoCapturer.h",
+        "objc/Framework/Headers/WebRTC/RTCH264ProfileLevelId.h",
+        "objc/Framework/Headers/WebRTC/RTCIceCandidate.h",
+        "objc/Framework/Headers/WebRTC/RTCIceServer.h",
+        "objc/Framework/Headers/WebRTC/RTCLegacyStatsReport.h",
+        "objc/Framework/Headers/WebRTC/RTCLogging.h",
+        "objc/Framework/Headers/WebRTC/RTCMTLNSVideoView.h",
+        "objc/Framework/Headers/WebRTC/RTCMTLVideoView.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",
+        "objc/Framework/Headers/WebRTC/RTCMetricsSampleInfo.h",
+        "objc/Framework/Headers/WebRTC/RTCNSGLVideoView.h",
+        "objc/Framework/Headers/WebRTC/RTCPeerConnection.h",
+        "objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h",
+        "objc/Framework/Headers/WebRTC/RTCPeerConnectionFactoryOptions.h",
+        "objc/Framework/Headers/WebRTC/RTCRtcpParameters.h",
+        "objc/Framework/Headers/WebRTC/RTCRtpCodecParameters.h",
+        "objc/Framework/Headers/WebRTC/RTCRtpEncodingParameters.h",
+        "objc/Framework/Headers/WebRTC/RTCRtpHeaderExtension.h",
+        "objc/Framework/Headers/WebRTC/RTCRtpParameters.h",
+        "objc/Framework/Headers/WebRTC/RTCRtpReceiver.h",
+        "objc/Framework/Headers/WebRTC/RTCRtpSender.h",
+        "objc/Framework/Headers/WebRTC/RTCRtpTransceiver.h",
+        "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/RTCVideoCodec.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoCodecFactory.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoCodecH264.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoCodecInfo.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoDecoderVP8.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoDecoderVP9.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoEncoderVP8.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoEncoderVP9.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoFrame.h",
+        "objc/Framework/Headers/WebRTC/RTCVideoFrameBuffer.h",
+        "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/Native/api/audio_device_module.h",
+        "objc/Framework/Native/api/video_decoder_factory.h",
+        "objc/Framework/Native/api/video_encoder_factory.h",
+        "objc/Framework/Native/api/video_frame_buffer.h",
+        "objc/Framework/Native/src/objc_video_decoder_factory.h",
+        "objc/Framework/Native/src/objc_video_encoder_factory.h",
+      ]
+    }
+
     if (rtc_include_tests) {
       if (is_ios) {
         rtc_library("sdk_unittests_sources") {

sdk/objc/Framework/Headers/WebRTC/RTCAudioSession.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "components/audio/RTCAudioSession.h"

sdk/objc/Framework/Headers/WebRTC/RTCAudioSessionConfiguration.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "components/audio/RTCAudioSessionConfiguration.h"

sdk/objc/Framework/Headers/WebRTC/RTCAudioSource.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "api/peerconnection/RTCAudioSource.h"

sdk/objc/Framework/Headers/WebRTC/RTCAudioTrack.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "api/peerconnection/RTCAudioTrack.h"

sdk/objc/Framework/Headers/WebRTC/RTCCVPixelBuffer.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "components/video_frame_buffer/RTCCVPixelBuffer.h"

sdk/objc/Framework/Headers/WebRTC/RTCCallbackLogger.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "api/logging/RTCCallbackLogger.h"

sdk/objc/Framework/Headers/WebRTC/RTCCameraPreviewView.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "helpers/RTCCameraPreviewView.h"

sdk/objc/Framework/Headers/WebRTC/RTCCameraVideoCapturer.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "components/capturer/RTCCameraVideoCapturer.h"

sdk/objc/Framework/Headers/WebRTC/RTCCertificate.h

@@ -0,0 +1,11 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "api/peerconnection/RTCCertificate.h"