Consolidate code monitoring low memory kills and OOM kills to MemoryKillsMonitor on ChromeOS.

chrome/browser/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 2135 matching lines @@
   }
 
   if (is_chromeos) {
     sources += [
       "download/notification/download_item_notification.cc",
       "download/notification/download_item_notification.h",
       "download/notification/download_notification.cc",
       "download/notification/download_notification.h",
       "download/notification/download_notification_manager.cc",
       "download/notification/download_notification_manager.h",
+      "memory/memory_kills_histogram.h",
+      "memory/memory_kills_monitor.cc",
+      "memory/memory_kills_monitor.h",
       "metrics/chromeos_metrics_provider.cc",
       "metrics/chromeos_metrics_provider.h",
       "metrics/leak_detector/leak_detector_controller.cc",
       "metrics/leak_detector/leak_detector_controller.h",
       "metrics/leak_detector/leak_detector_remote_controller.cc",
       "metrics/leak_detector/leak_detector_remote_controller.h",
       "metrics/perf/cpu_identity.cc",
       "metrics/perf/cpu_identity.h",
       "metrics/perf/perf_output.cc",
       "metrics/perf/perf_output.h",
@@ skipping 2245 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }