Add heap allocator usage to task profiler.

base/threading/worker_pool_posix.cc

Index: base/threading/worker_pool_posix.cc
diff --git a/base/threading/worker_pool_posix.cc b/base/threading/worker_pool_posix.cc
index aee5caccfbc7c75587d13a4afd419bf16c41fbe4..b30a6cc35965550c336cf191cc75d16f75d68928 100644
--- a/base/threading/worker_pool_posix.cc
+++ b/base/threading/worker_pool_posix.cc
@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/callback.h"
+#include "base/debug/scoped_thread_heap_usage.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ -89,12 +90,16 @@ void WorkerThread::ThreadMain() {
     TRACE_TASK_EXECUTION("WorkerThread::ThreadMain::Run", pending_task);
 
     tracked_objects::TaskStopwatch stopwatch;
+    base::debug::ScopedThreadHeapUsage heap_usage;
+    heap_usage.Start();
     stopwatch.Start();
     pending_task.task.Run();
     stopwatch.Stop();
+    heap_usage.Stop();
 
     tracked_objects::ThreadData::TallyRunOnWorkerThreadIfTracking(
-        pending_task.birth_tally, pending_task.time_posted, stopwatch);
+        pending_task.birth_tally, pending_task.time_posted, stopwatch,
+        heap_usage.usage());
   }
 
   // The WorkerThread is non-joinable, so it deletes itself.