Enable UMA histogram logger for low memor kill events in ArcMetricsService.

components/arc/BUILD.gn

 # Copyright 2015 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("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 static_library("arc") {
   sources = [
     "arc_bridge_bootstrap.cc",
@@ skipping 12 matching lines @@
     "clipboard/arc_clipboard_bridge.h",
     "crash_collector/arc_crash_collector_bridge.cc",
     "crash_collector/arc_crash_collector_bridge.h",
     "ime/arc_ime_bridge.h",
     "ime/arc_ime_bridge_impl.cc",
     "ime/arc_ime_bridge_impl.h",
     "ime/arc_ime_service.cc",
     "ime/arc_ime_service.h",
     "input/arc_input_bridge.cc",
     "input/arc_input_bridge.h",
+    "metrics/arc_low_memory_killer_monitor.cc",
+    "metrics/arc_low_memory_killer_monitor.h",
     "metrics/arc_metrics_service.cc",
     "metrics/arc_metrics_service.h",
     "net/arc_net_host_impl.cc",
     "net/arc_net_host_impl.h",
     "power/arc_power_bridge.cc",
     "power/arc_power_bridge.h",
   ]
 
   deps = [
     "//ash:ash",
     "//base",
     "//chromeos",
     "//chromeos:power_manager_proto",
     "//components/exo",
     "//components/onc",
     "//components/prefs",
     "//components/signin/core/account_id",
     "//google_apis",
     "//ipc:ipc",
     "//ipc/mojo:mojo",
     "//mojo/edk/system",
+    "//third_party/re2:re2",
     "//ui/arc",
     "//ui/aura",
     "//ui/base:base",
     "//ui/base/ime",
     "//ui/display:display",
     "//ui/events",
     "//ui/events:dom_keycode_converter",
   ]
 
   public_deps = [
@@ skipping 111 matching lines @@
 
   deps = [
     ":arc_standalone",
     ":arc_standalone_service",
     "//base",
     "//ipc:ipc",
     "//ipc/mojo:mojo",
     "//mojo/edk/system",
   ]
 }