Add base to "gn check".

base/trace_event/BUILD.gn

 # 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.
 
 source_set("trace_event") {
   sources = [
     "common/trace_event_common.h",
     "heap_profiler_allocation_context.cc",
     "heap_profiler_allocation_context.h",
     "heap_profiler_allocation_context_tracker.cc",
@@ skipping 50 matching lines @@
     "trace_event_system_stats_monitor.h",
     "trace_log.cc",
     "trace_log.h",
     "trace_log_constants.cc",
     "trace_sampling_thread.cc",
     "trace_sampling_thread.h",
     "winheap_dump_provider_win.cc",
     "winheap_dump_provider_win.h",
   ]
 
+  configs += [ "//base:base_implementation" ]
+
+  deps = [
+    "//base/debug",
+    "//base/json",
+    "//base/memory",
+    "//base/process",
+    "//base/third_party/dynamic_annotations",
+  ]
+
   if (is_nacl) {
     sources -= [
       "process_memory_totals_dump_provider.cc",
       "trace_event_system_stats_monitor.cc",
     ]
   }
 
   if (is_linux || is_android || is_mac) {
     sources += [
       "malloc_dump_provider.cc",
       "malloc_dump_provider.h",
     ]
+    deps += [ "//base/allocator:extension_thunks" ]
   }
 
   if (is_linux || is_android) {
     sources += [ "process_memory_maps_dump_provider.cc" ]
   }
-
-  configs += [ "//base:base_implementation" ]
-
-  deps = [
-    "//base/debug",
-    "//base/json",
-    "//base/memory",
-    "//base/process",
-    "//base/third_party/dynamic_annotations",
-  ]
-
   if (is_win) {
     deps += [ "//base/trace_event/etw_manifest:chrome_events_win" ]
   }
 
   allow_circular_includes_from = [
     "//base/debug",
     "//base/memory",
     "//base/process",
   ]
 
@@ skipping 25 matching lines @@
   if (is_linux || is_android) {
     sources += [ "process_memory_maps_dump_provider_unittest.cc" ]
   }
 
   deps = [
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }