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

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index e2c748d7af6ec7f71ba90fbaabf701f4faa23219..894238ab5bb29be40b7eb3af37dbb3b45018c3d5 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -541,6 +541,8 @@ component("base") {
     "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",
@@ -1250,6 +1252,7 @@ component("base") {
       "memory/shared_memory_helper.cc",
       "memory/shared_memory_helper.h",
       "memory/shared_memory_posix.cc",
+      "memory/shared_memory_tracker.cc",
       "native_library.cc",
       "native_library_posix.cc",
       "path_service.cc",
@@ -1589,13 +1592,6 @@ component("base") {
     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",