Major AEC3 render pipeline changes

webrtc/modules/audio_processing/test/aec_dump_based_simulator.cc

Index: webrtc/modules/audio_processing/test/aec_dump_based_simulator.cc
diff --git a/webrtc/modules/audio_processing/test/aec_dump_based_simulator.cc b/webrtc/modules/audio_processing/test/aec_dump_based_simulator.cc
index f444967a108955069df3002f0c934e108b83e09a..0b0c18a42577ec94c1ef5f49fb6f916fcc610e1d 100644
--- a/webrtc/modules/audio_processing/test/aec_dump_based_simulator.cc
+++ b/webrtc/modules/audio_processing/test/aec_dump_based_simulator.cc
@@ -89,11 +89,11 @@ void AecDumpBasedSimulator::PrepareProcessStreamCall(
               interface_used_ == InterfaceType::kNotSpecified);
     interface_used_ = InterfaceType::kFloatInterface;
 
-    RTC_CHECK_EQ(in_buf_->num_channels(),
-                 static_cast<size_t>(msg.input_channel_size()));
+    // RTC_CHECK_EQ(in_buf_->num_channels(),
+    //              static_cast<size_t>(msg.input_channel_size()));
 
     // Populate input buffer.
-    for (int i = 0; i < msg.input_channel_size(); ++i) {
+    for (size_t i = 0; i < in_buf_->num_channels(); ++i) {
       RTC_CHECK_EQ(in_buf_->num_frames() * sizeof(*in_buf_->channels()[i]),
                    msg.input_channel(i).size());
       std::memcpy(in_buf_->channels()[i], msg.input_channel(i).data(),