[Startup Tracing] Enable startup tracing from config file

components/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
@@ skipping 80 matching lines @@
     "//components/resources:components_resources",
     "//components/search",
     "//components/search_engines",
     "//components/search_provider_logos",
     "//components/sessions",
     "//components/signin/core/browser",
     "//components/startup_metric_utils",
     "//components/strings",
     "//components/sync_driver",
     "//components/tracing",
+    "//components/tracing:startup_tracing",
     "//components/translate/content/browser",
     "//components/translate/content/common",
     "//components/translate/content/renderer",
     "//components/translate/core/browser",
     "//components/translate/core/common",
     "//components/ui/zoom:ui_zoom",
     "//components/undo",
     "//components/update_client",
     "//components/url_fixer",
     "//components/url_matcher",
@@ skipping 279 matching lines @@
     "//content/test:test_support",
     "//device/bluetooth",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
   ]
 
   data_deps = [ ":components_tests_pak" ]
 
   if (is_android) {
-    sources += [
-      "test/android/browsertests_apk/components_browser_tests_jni_onload.cc",
-    ]
+    sources += [ "test/android/browsertests_apk/components_browser_tests_jni_onload.cc" ]
     sources -= [ "autofill/content/browser/risk/fingerprint_browsertest.cc" ]
     deps += [ "//testing/android/native_test:native_test_support" ]
     use_launcher = false
     isolate_file = "components_browsertests.isolate"
   }
 
   if (is_linux) {
     # content_extractor_browsertest is a standalone content extraction tool built as
     # a MANUAL component_browsertest.
     sources += [ "dom_distiller/standalone/content_extractor_browsertest.cc" ]
@@ skipping 15 matching lines @@
 
   deps = [
     "//base",
     "//base/test:test_support_perf",
     "//testing/gtest",
     "//testing/perf",
     "//content/test:test_support",
     "//components/visitedlink/browser",
   ]
 }