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

components/arc.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/arc
       'target_name': 'arc',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         'arc_mojo_bindings',
         'components.gyp:exo',
         'components.gyp:onc_component',
         '../base/base.gyp:base',
         '../chromeos/chromeos.gyp:chromeos',
         '../chromeos/chromeos.gyp:power_manager_proto',
         '../ipc/ipc.gyp:ipc',
+        '../third_party/re2/re2.gyp:re2',
         '../ui/arc/arc.gyp:arc',
         '../ui/aura/aura.gyp:aura',
         '../ui/base/ime/ui_base_ime.gyp:ui_base_ime',
         '../ui/base/ui_base.gyp:ui_base',
         '../ui/base/ui_base.gyp:ui_base_test_support',
         '../ui/events/events.gyp:events_base',
       ],
       'sources': [
         'arc/arc_bridge_bootstrap.cc',
         'arc/arc_bridge_bootstrap.h',
@@ skipping 11 matching lines @@
         'arc/clipboard/arc_clipboard_bridge.h',
         'arc/crash_collector/arc_crash_collector_bridge.cc',
         'arc/crash_collector/arc_crash_collector_bridge.h',
         'arc/ime/arc_ime_bridge.h',
         'arc/ime/arc_ime_bridge_impl.cc',
         'arc/ime/arc_ime_bridge_impl.h',
         'arc/ime/arc_ime_service.cc',
         'arc/ime/arc_ime_service.h',
         'arc/input/arc_input_bridge.cc',
         'arc/input/arc_input_bridge.h',
+        'arc/metrics/arc_low_memory_killer_monitor.h',
+        'arc/metrics/arc_low_memory_killer_monitor.cc',
         'arc/metrics/arc_metrics_service.cc',
         'arc/metrics/arc_metrics_service.h',
         'arc/net/arc_net_host_impl.cc',
         'arc/net/arc_net_host_impl.h',
         'arc/power/arc_power_bridge.cc',
         'arc/power/arc_power_bridge.h',
       ],
     },
     {
       # GN version: //components/arc_test_support
@@ skipping 87 matching lines @@
         '../base/base.gyp:base',
         '../ipc/ipc.gyp:ipc',
         '../mojo/mojo_edk.gyp:mojo_system_impl',
       ],
       'sources': [
         'arc/standalone/arc_standalone_bridge_main.cc',
       ]
     }
   ],
 }