[WIP] Add SharedMemoryTracker to dump base::SharedMemory usage

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 496 matching lines @@
     "memory/shared_memory_android.cc",
     "memory/shared_memory_handle.cc",
     "memory/shared_memory_handle.h",
     "memory/shared_memory_handle_mac.cc",
     "memory/shared_memory_handle_win.cc",
     "memory/shared_memory_helper.cc",
     "memory/shared_memory_helper.h",
     "memory/shared_memory_mac.cc",
     "memory/shared_memory_nacl.cc",
     "memory/shared_memory_posix.cc",
+    "memory/shared_memory_tracker.cc",
+    "memory/shared_memory_tracker.h",
     "memory/shared_memory_win.cc",
     "memory/singleton.cc",
     "memory/singleton.h",
     "memory/weak_ptr.cc",
     "memory/weak_ptr.h",
     "message_loop/incoming_task_queue.cc",
     "message_loop/incoming_task_queue.h",
     "message_loop/message_loop.cc",
     "message_loop/message_loop.h",
     "message_loop/message_loop_task_runner.cc",
@@ skipping 1115 matching lines @@
       "time/time_conversion_posix.cc",
       "time/time_exploded_posix.cc",
       "time/time_now_posix.cc",
     ]
   }
 
   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 1097 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }