Refactor rtc_unittests into several targets.

webrtc/api/BUILD.gn

 # Copyright (c) 2015 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/webrtc.gni")
 if (is_android) {
@@ skipping 206 matching lines @@
       cflags = [ "-Wno-sign-compare" ]
     }
   }
 
   rtc_test("peerconnection_unittests") {
     check_includes = false  # TODO(kjellander): Remove (bugs.webrtc.org/6828)
     testonly = true
     sources = [
       "datachannel_unittest.cc",
       "dtmfsender_unittest.cc",
-      "fakemetricsobserver.cc",
-      "fakemetricsobserver.h",
       "jsepsessiondescription_unittest.cc",
       "localaudiosource_unittest.cc",
       "mediaconstraintsinterface_unittest.cc",
       "mediastream_unittest.cc",
       "peerconnection_unittest.cc",
       "peerconnectionendtoend_unittest.cc",
       "peerconnectionfactory_unittest.cc",
       "peerconnectioninterface_unittest.cc",
       "proxy_unittest.cc",
       "rtcstats_integrationtest.cc",
@@ skipping 61 matching lines @@
         "test/androidtestinitializer.h",
       ]
       deps += [
         "//testing/android/native_test:native_test_support",
         "//webrtc/sdk/android:libjingle_peerconnection_java",
         "//webrtc/sdk/android:libjingle_peerconnection_jni",
       ]
     }
 
     deps += [
+      ":fakemetricsobserver",
       ":libjingle_peerconnection",
       "..:webrtc_common",
       "../base:rtc_base_tests_utils",
       "../media:rtc_unittest_main",
       "../pc:rtc_pc",
       "../system_wrappers:metrics_default",
       "//testing/gmock",
     ]
 
     if (is_android) {
@@ skipping 11 matching lines @@
 
     public_deps = [
       ":audio_mixer_api",
     ]
 
     deps = [
       "//testing/gmock",
       "//webrtc/test:test_support",
     ]
   }
+
+  rtc_source_set("fakemetricsobserver") {
+    testonly = true
+    sources = [
+      "fakemetricsobserver.cc",
+      "fakemetricsobserver.h",
+    ]
+    deps = [
+      ":libjingle_peerconnection",
+      "../base:rtc_base_approved",
+    ]
+    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" ]
+    }
+  }
 }