Adding full initial version of delay estimation functionality in echo canceller 3

webrtc/modules/audio_processing/aec3/block_processor_unittest.cc

Index: webrtc/modules/audio_processing/aec3/block_processor_unittest.cc
diff --git a/webrtc/modules/audio_processing/aec3/block_processor_unittest.cc b/webrtc/modules/audio_processing/aec3/block_processor_unittest.cc
index b5d6a1432f4a9d6891020d1d8a61d4e1cc5c0138..ac3af6afb12da84c160cc827e188916536a15882 100644
--- a/webrtc/modules/audio_processing/aec3/block_processor_unittest.cc
+++ b/webrtc/modules/audio_processing/aec3/block_processor_unittest.cc
@@ -252,6 +252,12 @@ TEST(BlockProcessor, NullBufferRenderParameter) {
                "");
 }
 
+// Verifies the check for correct sample rate.
+TEST(BlockProcessor, WrongSampleRate) {
+  EXPECT_DEATH(std::unique_ptr<BlockProcessor>(BlockProcessor::Create(8001)),
+               "");
+}
+
 #endif
 
 }  // namespace webrtc