Bugfix that fixes the integration issue that cause WebRTC AEC mobile to fail

webrtc/modules/audio_processing/audio_processing_impl.cc

Index: webrtc/modules/audio_processing/audio_processing_impl.cc
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index 805e05eeee8d71643ca5d72b10df251b39a11e66..eb17e9ef9bc5f8cbb73cb6a5d4149d9afdf99e22 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -503,6 +503,12 @@ void AudioProcessingImpl::SetExtraOptions(const Config& config) {
   }
 }
 
+int AudioProcessingImpl::input_sample_rate_hz() const {
+  // Accessed from outside APM, hence a lock is needed.
+  rtc::CritScope cs(&crit_capture_);
+  return formats_.api_format.input_stream().sample_rate_hz();
+}
+
 int AudioProcessingImpl::proc_sample_rate_hz() const {
   // Used as callback from submodules, hence locking is not allowed.
   return capture_nonlocked_.fwd_proc_format.sample_rate_hz();