Test and fix for huge bwe drop after alr state.

webrtc/audio/BUILD.gn

Index: webrtc/audio/BUILD.gn
diff --git a/webrtc/audio/BUILD.gn b/webrtc/audio/BUILD.gn
index 1757e4e0dd108c8953a2de56dcd5927ba4ecbc89..48a6706f2d16a11e990f98ee77c60b0639b0dde1 100644
--- a/webrtc/audio/BUILD.gn
+++ b/webrtc/audio/BUILD.gn
@@ -112,6 +112,8 @@ if (rtc_include_tests) {
         "../test:fake_audio_device",
         "../test:test_common",
         "../test:test_main",
+        "//testing/gmock",
+        "//testing/gtest",
         "//third_party/gflags",
       ]
       if (is_android) {
@@ -121,6 +123,7 @@ if (rtc_include_tests) {
       data = [
         "//resources/voice_engine/audio_tiny16.wav",
         "//resources/voice_engine/audio_tiny48.wav",
+        "//resources/voice_engine/audio_dtx16.wav",
       ]
 
       if (!build_with_chromium && is_clang) {
@@ -129,4 +132,40 @@ if (rtc_include_tests) {
       }
     }
   }
+
+  rtc_source_set("audio_perf_tests") {
+    testonly = true
+
+    # Skip restricting visibility on mobile platforms since the tests on those
+    # gets additional generated targets which would require many lines here to
+    # cover (which would be confusing to read and hard to maintain).
+    if (!is_android && !is_ios) {
+      visibility = [ "//webrtc:webrtc_perf_tests" ]
+    }
+    sources = [
+      "test/audio_bwe_integration_test.cc",
+      "test/audio_bwe_integration_test.h",
+    ]
+    deps = [
+      "../base:rtc_base_approved",
+      "../common_audio",
+      "../system_wrappers",
+      "../test:fake_audio_device",
+      "../test:field_trial",
+      "../test:test_common",
+      "../test:test_main",
+      "//testing/gmock",
+      "//testing/gtest",
+      "//third_party/gflags",
+    ]
+
+    data = [
+      "//resources/voice_engine/audio_dtx16.wav",
+    ]
+
+    if (!build_with_chromium && is_clang) {
+      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
+      suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
+    }
+  }
 }