Reland "Reland "Refactor NetEq delay manager logic.""

This is a reland of 2a7c57c34f323ee1977f6e7809ee23bfcf9a7459

Original change's description:
> Reland "Refactor NetEq delay manager logic."
>
> This is a reland of f8e62fcb14e37a5be4f1e4f599d34c8483fea8e9
>
> Original change's description:
> > Refactor NetEq delay manager logic.
> >
> > - Removes dependence on sequence number for calculating target delay.
> > - Changes target delay unit to milliseconds instead of number of
> >   packets.
> > - Moves acceleration/preemptive expand thresholds to decision logic.
> >   Tests for this will be added in a follow up cl.
> >
> > Bug: webrtc:10333
> > Change-Id: If690aae4abf41ef1d9353f0ff01fb7d121cf8a26
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/186265
> > Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org>
> > Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#32326}
>
> Bug: webrtc:10333
> Change-Id: Iad5e7063f63b84762959ee5b412f5f14a7b2cd06
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/186943
> Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org>
> Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#32332}

Bug: webrtc:10333
Change-Id: If2244ee9a3d56a0cfa9b602e7bdf448dc6340147
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/187356
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32367}
diff --git a/modules/audio_coding/neteq/neteq_impl_unittest.cc b/modules/audio_coding/neteq/neteq_impl_unittest.cc
index 5c7259f..44660fc 100644
--- a/modules/audio_coding/neteq/neteq_impl_unittest.cc
+++ b/modules/audio_coding/neteq/neteq_impl_unittest.cc
@@ -804,8 +804,10 @@
     EXPECT_EQ(NetEq::kOK, neteq_->GetAudio(&output, &muted));
   }
 
-  // Insert one more packet.
-  insert_packet();
+  // Insert a few packets to avoid postpone decoding after expand.
+  for (size_t i = 0; i < 5; ++i) {
+    insert_packet();
+  }
 
   // Pull audio until the newly inserted packet is decoded and the PLC ends.
   while (output.speech_type_ != AudioFrame::kNormalSpeech) {
@@ -881,8 +883,10 @@
     EXPECT_NE(AudioFrame::kNormalSpeech, output.speech_type_);
   }
 
-  // Insert one more packet.
-  insert_packet();
+  // Insert a few packets to avoid postpone decoding after expand.
+  for (size_t i = 0; i < 5; ++i) {
+    insert_packet();
+  }
 
   // Pull audio until the newly inserted packet is decoded and the PLC ends.
   while (output.speech_type_ != AudioFrame::kNormalSpeech) {
@@ -1299,7 +1303,7 @@
                                           SdpAudioFormat("L16", 8000, 1)));
 
   // Insert packets.
-  for (int i = 0; i < 6; ++i) {
+  for (int i = 0; i < 20; ++i) {
     rtp_header.sequenceNumber += 1;
     rtp_header.timestamp += kFrameLengthSamples;
     EXPECT_EQ(NetEq::kOK, neteq_->InsertPacket(rtp_header, payload));