Refactor webrtc_perf_tests into several source_sets.

BUG=webrtc:6954

Review-Url: https://codereview.webrtc.org/2609403002
Cr-Commit-Position: refs/heads/master@{#15902}

webrtc/modules/audio_coding/BUILD.gn

@@ -1136,6 +1136,27 @@ if (rtc_include_tests) {
     }
   }
 
+  rtc_source_set("audio_coding_perf_tests") {
+    testonly = true
+    sources = [
+      "codecs/opus/opus_complexity_unittest.cc",
+      "neteq/test/neteq_performance_unittest.cc",
+    ]
+    deps = [
+      ":neteq_test_support",
+      ":neteq_unittest_tools",
+      ":webrtc_opus",
+      "../..:webrtc_common",
+      "../../base:rtc_base_approved",
+      "../../system_wrappers:system_wrappers",
+      "../../test:test_support",
+    ]
+    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" ]
+    }
+  }
+
   rtc_source_set("acm_receive_test") {
     testonly = true
     sources = [