Added ARM Neon SIMD optimizations for AEC3

webrtc/modules/audio_processing/aec3/adaptive_fir_filter.h

Index: webrtc/modules/audio_processing/aec3/adaptive_fir_filter.h
diff --git a/webrtc/modules/audio_processing/aec3/adaptive_fir_filter.h b/webrtc/modules/audio_processing/aec3/adaptive_fir_filter.h
index 78b64225bda53f942f9e434bcdb97e51ad88a59e..75c418bf0f0acb4a78b1c909d9bd5c1bcfbfd5e3 100644
--- a/webrtc/modules/audio_processing/aec3/adaptive_fir_filter.h
+++ b/webrtc/modules/audio_processing/aec3/adaptive_fir_filter.h
@@ -29,6 +29,11 @@ namespace aec3 {
 void UpdateFrequencyResponse(
     rtc::ArrayView<const FftData> H,
     std::vector<std::array<float, kFftLengthBy2Plus1>>* H2);
+#if defined(WEBRTC_HAS_NEON)
+void UpdateFrequencyResponse_NEON(
+    rtc::ArrayView<const FftData> H,
+    std::vector<std::array<float, kFftLengthBy2Plus1>>* H2);
+#endif
 #if defined(WEBRTC_ARCH_X86_FAMILY)
 void UpdateFrequencyResponse_SSE2(
     rtc::ArrayView<const FftData> H,
@@ -40,6 +45,11 @@ void UpdateFrequencyResponse_SSE2(
 void UpdateErlEstimator(
     const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
     std::array<float, kFftLengthBy2Plus1>* erl);
+#if defined(WEBRTC_HAS_NEON)
+void UpdateErlEstimator_NEON(
+    const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
+    std::array<float, kFftLengthBy2Plus1>* erl);
+#endif
 #if defined(WEBRTC_ARCH_X86_FAMILY)
 void UpdateErlEstimator_SSE2(
     const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
@@ -50,6 +60,11 @@ void UpdateErlEstimator_SSE2(
 void AdaptPartitions(const RenderBuffer& render_buffer,
                      const FftData& G,
                      rtc::ArrayView<FftData> H);
+#if defined(WEBRTC_HAS_NEON)
+void AdaptPartitions_NEON(const RenderBuffer& render_buffer,
+                          const FftData& G,
+                          rtc::ArrayView<FftData> H);
+#endif
 #if defined(WEBRTC_ARCH_X86_FAMILY)
 void AdaptPartitions_SSE2(const RenderBuffer& render_buffer,
                           const FftData& G,
@@ -60,6 +75,11 @@ void AdaptPartitions_SSE2(const RenderBuffer& render_buffer,
 void ApplyFilter(const RenderBuffer& render_buffer,
                  rtc::ArrayView<const FftData> H,
                  FftData* S);
+#if defined(WEBRTC_HAS_NEON)
+void ApplyFilter_NEON(const RenderBuffer& render_buffer,
+                      rtc::ArrayView<const FftData> H,
+                      FftData* S);
+#endif
 #if defined(WEBRTC_ARCH_X86_FAMILY)
 void ApplyFilter_SSE2(const RenderBuffer& render_buffer,
                       rtc::ArrayView<const FftData> H,