Revert of Remove the deprecated EncodeInternal interface from AudioEncoder

webrtc/modules/audio_coding/acm2/audio_coding_module_impl.cc

Index: webrtc/modules/audio_coding/acm2/audio_coding_module_impl.cc
diff --git a/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.cc b/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.cc
index f3e47edfd9edb9c2ad5c19f1919a888d7f5047f8..d30daaaf3407f6a221d987eca57ba3917429fee8 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.cc
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module_impl.cc
@@ -104,6 +104,7 @@
 class RawAudioEncoderWrapper final : public AudioEncoder {
  public:
   RawAudioEncoderWrapper(AudioEncoder* enc) : enc_(enc) {}
+  size_t MaxEncodedBytes() const override { return enc_->MaxEncodedBytes(); }
   int SampleRateHz() const override { return enc_->SampleRateHz(); }
   size_t NumChannels() const override { return enc_->NumChannels(); }
   int RtpTimestampRateHz() const override { return enc_->RtpTimestampRateHz(); }
@@ -118,6 +119,13 @@
                          rtc::ArrayView<const int16_t> audio,
                          rtc::Buffer* encoded) override {
     return enc_->Encode(rtp_timestamp, audio, encoded);
+  }
+  EncodedInfo EncodeInternal(uint32_t rtp_timestamp,
+                             rtc::ArrayView<const int16_t> audio,
+                             size_t max_encoded_bytes,
+                             uint8_t* encoded) override {
+    return enc_->EncodeInternal(rtp_timestamp, audio, max_encoded_bytes,
+                                encoded);
   }
   void Reset() override { return enc_->Reset(); }
   bool SetFec(bool enable) override { return enc_->SetFec(enable); }