Added a perf test for the residual echo detector.

webrtc/modules/audio_processing/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("//build/config/arm.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 370 matching lines @@
       "//testing/gtest",
       "//third_party/gflags:gflags",
     ]
   }  # audioproc_f
 
   rtc_source_set("audioproc_test_utils") {
     testonly = true
     sources = [
       "test/audio_buffer_tools.cc",
       "test/audio_buffer_tools.h",
+      "test/performance_timer.cc",
+      "test/performance_timer.h",
+      "test/simulator_buffers.cc",
+      "test/simulator_buffers.h",
       "test/test_utils.cc",
       "test/test_utils.h",
     ]
 
     deps = [
       "../../base:rtc_base_approved",
       "../../common_audio",
     ]
   }
 
@@ skipping 69 matching lines @@
         "test/protobuf_utils.cc",
         "test/protobuf_utils.h",
       ]
 
       deps = [
         ":audioproc_debug_proto",
       ]
     }
   }
 }