Move the aec_rdft* files to a more proper place beneath APM and make them thread-safe.

webrtc/modules/audio_processing/aec/aec_core_optimized_methods.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 13 matching lines @@
     float x_fft_buf[2][kExtendedNumPartitions * PART_LEN1],
     float h_fft_buf[2][kExtendedNumPartitions * PART_LEN1],
     float y_fft[2][PART_LEN1]);
 extern WebRtcAecFilterFar WebRtcAec_FilterFar;
 typedef void (*WebRtcAecScaleErrorSignal)(float mu,
                                           float error_threshold,
                                           float x_pow[PART_LEN1],
                                           float ef[2][PART_LEN1]);
 extern WebRtcAecScaleErrorSignal WebRtcAec_ScaleErrorSignal;
 typedef void (*WebRtcAecFilterAdaptation)(
+    const OouraFft& ooura_fft,
     int num_partitions,
     int x_fft_buf_block_pos,
     float x_fft_buf[2][kExtendedNumPartitions * PART_LEN1],
     float e_fft[2][PART_LEN1],
     float h_fft_buf[2][kExtendedNumPartitions * PART_LEN1]);
 extern WebRtcAecFilterAdaptation WebRtcAec_FilterAdaptation;
 
 typedef void (*WebRtcAecOverdrive)(float overdrive_scaling,
                                    const float hNlFb,
                                    float hNl[PART_LEN1]);
@@ skipping 26 matching lines @@
 typedef void (*WebRtcAecStoreAsComplex)(const float* data,
                                         float data_complex[2][PART_LEN1]);
 extern WebRtcAecStoreAsComplex WebRtcAec_StoreAsComplex;
 
 typedef void (*WebRtcAecWindowData)(float* x_windowed, const float* x);
 extern WebRtcAecWindowData WebRtcAec_WindowData;
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_OPTIMIZED_METHODS_H_