Moving webrtc/stats/ into webrtc/api/ to resolve a circular dependency

webrtc/stats/BUILD.gn

-# Copyright (c) 2016 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")
-
-group("stats") {
-  deps = [
-    ":rtc_stats",
-  ]
-}
-
-# GYP version: webrtc/stats/stats.gyp:rtc_stats
-rtc_source_set("rtc_stats") {
-  cflags = []
-  sources = [
-    "rtcstats.cc",
-    "rtcstats_objects.cc",
-    "rtcstatscollector.cc",
-    "rtcstatscollector.h",
-    "rtcstatsreport.cc",
-  ]
-
-  if (is_clang) {
-    # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
-    suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
-  }
-
-  deps = [
-    "../api:libjingle_peerconnection",
-  ]
-}
-
-if (rtc_include_tests) {
-  # GYP version: webrtc/stats/stats.gyp:rtc_stats_unittests
-  rtc_test("rtc_stats_unittests") {
-    testonly = true
-    sources = [
-      "rtcstats_unittest.cc",
-      "rtcstatscollector_unittest.cc",
-      "rtcstatsreport_unittest.cc",
-    ]
-
-    if (is_clang) {
-      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
-      suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
-    }
-
-    deps = [
-      ":rtc_stats",
-      "../base:rtc_base_tests_utils",
-      "../system_wrappers:metrics_default",
-      "//testing/gmock",
-    ]
-
-    if (is_android) {
-      deps += [ "//testing/android/native_test:native_test_native_code" ]
-    }
-  }
-}