Adding APM configuration in AEC dump.

webrtc/modules/audio_processing/echo_cancellation_impl.cc

Index: webrtc/modules/audio_processing/echo_cancellation_impl.cc
diff --git a/webrtc/modules/audio_processing/echo_cancellation_impl.cc b/webrtc/modules/audio_processing/echo_cancellation_impl.cc
index 86ed9234c78bb59cb98da33fbce664a0678ac5d0..3890334a1f616da94a4f9e210657b3a828886335 100644
--- a/webrtc/modules/audio_processing/echo_cancellation_impl.cc
+++ b/webrtc/modules/audio_processing/echo_cancellation_impl.cc
@@ -280,6 +280,10 @@ bool EchoCancellationImpl::is_delay_logging_enabled() const {
   return delay_logging_enabled_;
 }
 
+bool EchoCancellationImpl::is_extended_filter_enabled() const {
+  return extended_filter_enabled_;
+}
+
 // TODO(bjornv): How should we handle the multi-channel case?
 int EchoCancellationImpl::GetDelayMetrics(int* median, int* std) {
   float fraction_poor_delays = 0;