Do not invalidate stream when the secondary outputs are changed.

When a dynamic policy is registered, the secondary outputs may be
changed. Instead of tearing down the tracks, only tracks whose secondary
outputs are changed will be updated with the new secondary outputs.

Bug: 181582467
Test: atest AudioPlaybackCaptureTest audiopolicy_tests
Test: repo steps in the bug
Change-Id: I9a47a0a4b37ad3f4a1d554dd726ebffb27325141
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index d878611..25a19a2 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2425,7 +2425,7 @@
                           channelMask, frameCount,
                           nullptr /* buffer */, (size_t)0 /* bufferSize */, sharedBuffer,
                           sessionId, creatorPid, identity, trackFlags, TrackBase::TYPE_DEFAULT,
-                          portId, SIZE_MAX /*frameCountToBeReady*/);
+                          portId, SIZE_MAX /*frameCountToBeReady*/, speed);
 
         lStatus = track != 0 ? track->initCheck() : (status_t) NO_MEMORY;
         if (lStatus != NO_ERROR) {
@@ -3321,6 +3321,17 @@
     invalidateTracks_l(streamType);
 }
 
+// getTrackById_l must be called with holding thread lock
+AudioFlinger::PlaybackThread::Track* AudioFlinger::PlaybackThread::getTrackById_l(
+        audio_port_handle_t trackPortId) {
+    for (size_t i = 0; i < mTracks.size(); i++) {
+        if (mTracks[i]->portId() == trackPortId) {
+            return mTracks[i].get();
+        }
+    }
+    return nullptr;
+}
+
 status_t AudioFlinger::PlaybackThread::addEffectChain_l(const sp<EffectChain>& chain)
 {
     audio_session_t session = chain->sessionId();