Add TaskRunner wrapper for WorkerPool.

base/threading/worker_pool_win.cc

Index: base/threading/worker_pool_win.cc
diff --git a/base/threading/worker_pool_win.cc b/base/threading/worker_pool_win.cc
index 86463c7ec2ccbcf4c94eedd0d98f9db54ad64450..1e8be268748e52842d5fe24ce5a22dad9e9606eb 100644
--- a/base/threading/worker_pool_win.cc
+++ b/base/threading/worker_pool_win.cc
@@ -9,12 +9,16 @@
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/pending_task.h"
+#include "base/threading/thread_local.h"
 #include "base/tracked_objects.h"
 
 namespace base {
 
 namespace {
 
+base::LazyInstance<ThreadLocalBoolean>::Leaky
+    g_worker_pool_running_on_this_thread = LAZY_INSTANCE_INITIALIZER;
+
 DWORD CALLBACK WorkItemCallback(void* param) {
   PendingTask* pending_task = static_cast<PendingTask*>(param);
   TRACE_EVENT2("task", "WorkItemCallback::Run",
@@ -24,7 +28,9 @@ DWORD CALLBACK WorkItemCallback(void* param) {
   tracked_objects::TrackedTime start_time =
       tracked_objects::ThreadData::NowForStartOfRun(pending_task->birth_tally);
 
+  g_worker_pool_running_on_this_thread.Get().Set(true);
   pending_task->task.Run();
+  g_worker_pool_running_on_this_thread.Get().Set(false);
 
   tracked_objects::ThreadData::TallyRunOnWorkerThreadIfTracking(
       pending_task->birth_tally,
@@ -52,10 +58,16 @@ bool PostTaskInternal(PendingTask* pending_task, bool task_is_slow) {
 
 }  // namespace
 
+// static
 bool WorkerPool::PostTask(const tracked_objects::Location& from_here,
                           const base::Closure& task, bool task_is_slow) {
   PendingTask* pending_task = new PendingTask(from_here, task);
   return PostTaskInternal(pending_task, task_is_slow);
 }
 
+// static
+bool WorkerPool::RunsTasksOnCurrentThread() {
+  return g_worker_pool_running_on_this_thread.Get().Get();
+}
+
 }  // namespace base