Add 'flog' service implementation.

services/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.
 
 group("services") {
   testonly = true
 
   deps = [
     ":tests",
     "//services/asset_bundle",
     "//services/authenticating_url_loader_interceptor",
     "//services/authentication",
     "//services/clipboard",
     "//services/dart",
     "//services/debugger",
+    "//services/flog",
     "//services/gles2:lib",
     "//services/http_server",
     "//services/icu_data",
     "//services/log",
     "//services/native_support",
     "//services/prediction",
     "//services/test_service:bindings",
     "//services/tracing",
   ]
 
@@ skipping 89 matching lines @@
   }
 
   if (is_android || is_linux) {
     deps += [
       "//services/files:apptests",
       "//services/log:apptests",
       "//services/url_response_disk_cache:tests",
     ]
   }
 }