Add SetAudioPlayout and SetAudioRecording methods to the PeerConnection API

(this CL is based on the work by Taylor and Steve in https://webrtc-review.googlesource.com/c/src/+/10201)

This SetAudioPlayout method lets applications disable audio playout while
still processing incoming audio data and generating statistics on the
received audio.

This may be useful if the application wants to set up media flows as
soon as possible, but isn't ready to play audio yet. Currently, native
applications don't have any API point to control this, unless they
completely implement their own AudioDeviceModule.

The SetAudioRecording works in a similar fashion but for the recorded
audio. One difference is that calling SetAudioRecording(false) does not
keep any audio processing alive.

TBR=solenberg

Bug: webrtc:7313
Change-Id: I0aa075f6bfef9818f1080f85a8ff7842fb0750aa
Reviewed-on: https://webrtc-review.googlesource.com/16180
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Henrik Andreassson <henrika@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20499}

sdk/android/src/jni/pc/peerconnection_jni.cc

@@ -166,6 +166,22 @@ JNI_FUNCTION_DECLARATION(void,
       observer, JavaToNativeSessionDescription(jni, j_sdp));
 }
 
+JNI_FUNCTION_DECLARATION(void,
+                         PeerConnection_setAudioPlayout,
+                         JNIEnv* jni,
+                         jobject j_pc,
+                         jboolean playout) {
+  ExtractNativePC(jni, j_pc)->SetAudioPlayout(playout);
+}
+
+JNI_FUNCTION_DECLARATION(void,
+                         PeerConnection_setAudioRecording,
+                         JNIEnv* jni,
+                         jobject j_pc,
+                         jboolean recording) {
+  ExtractNativePC(jni, j_pc)->SetAudioRecording(recording);
+}
+
 JNI_FUNCTION_DECLARATION(jboolean,
                          PeerConnection_nativeSetConfiguration,
                          JNIEnv* jni,