base: Introduce SharedMemoryTracker for POSIX (but not macOS)

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 1516 matching lines @@
       "time/time_mac.cc",
     ]
 
     set_sources_assignment_filter(sources_assignment_filter)
   }
 
   if (is_posix && !is_mac && !is_ios && !is_android && !is_chromeos) {
     sources += [ "power_monitor/power_monitor_device_source_posix.cc" ]
   }
 
+  if (is_posix && !is_mac && !is_nacl) {
+    sources += [
+      "memory/shared_memory_tracker.cc",
+      "memory/shared_memory_tracker.h",
+    ]
+  }
+
   if (!use_glib) {
     sources -= [
       "message_loop/message_pump_glib.cc",
       "message_loop/message_pump_glib.h",
     ]
   }
 
   if (using_sanitizer) {
     data += [ "//tools/valgrind/asan/" ]
     if (is_win) {
@@ skipping 1040 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }