Added first layer of the echo canceller 3 functionality

webrtc/modules/audio_processing/aec3/block_processor.cc

Index: webrtc/modules/audio_processing/aec3/block_processor.cc
diff --git a/webrtc/modules/audio_processing/aec3/block_processor.cc b/webrtc/modules/audio_processing/aec3/block_processor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dc64a748dd747da4c1d501cca5b62b86d8b290fa
--- /dev/null
+++ b/webrtc/modules/audio_processing/aec3/block_processor.cc
@@ -0,0 +1,41 @@
+/*
+ *  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.
+ */
+#include "webrtc/modules/audio_processing/aec3/block_processor.h"
+
+#include "webrtc/base/atomicops.h"
+#include "webrtc/base/optional.h"
+
+namespace webrtc {
+
+BlockProcessor* BlockProcessor::Create(int sample_rate_hz, size_t num_bands) {
+  return new BlockProcessorImpl(sample_rate_hz, num_bands);
+}
+
+int BlockProcessorImpl::instance_count_ = 0;
+
+BlockProcessorImpl::BlockProcessorImpl(int sample_rate_hz, size_t num_bands)
+    : data_dumper_(new ApmDataDumper(instance_count_)) {
+  instance_count_ = rtc::AtomicOps::Increment(&instance_count_);
+}
+
+BlockProcessorImpl::~BlockProcessorImpl() = default;
+
+void BlockProcessorImpl::ProcessCapture(
+    bool known_echo_path_change,
+    bool saturated_microphone_signal,
+    std::vector<std::vector<float>>* capture_block) {}
+
+bool BlockProcessorImpl::BufferRender(std::vector<std::vector<float>>* block) {
+  return false;
+}
+
+void BlockProcessorImpl::ReportEchoLeakage(bool leakage_detected) {}
+
+}  // namespace webrtc