TaskScheduler: Match behavior of SequencedWorkerPool in RunsTasksOnCurrentThread().

base/task_scheduler/scheduler_worker_pool_impl.cc

Index: base/task_scheduler/scheduler_worker_pool_impl.cc
diff --git a/base/task_scheduler/scheduler_worker_pool_impl.cc b/base/task_scheduler/scheduler_worker_pool_impl.cc
index e5599dd6e6e3ae010ba04998aadf2ec9fbe518d0..6b938ecae750e143c9d6aeac9b22706ddc20dcd7 100644
--- a/base/task_scheduler/scheduler_worker_pool_impl.cc
+++ b/base/task_scheduler/scheduler_worker_pool_impl.cc
@@ -15,6 +15,7 @@
 #include "base/lazy_instance.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram.h"
+#include "base/sequence_token.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
@@ -110,7 +111,9 @@ class SchedulerSequencedTaskRunner : public SequencedTaskRunner {
   }
 
   bool RunsTasksOnCurrentThread() const override {
-    return tls_current_worker_pool.Get().Get() == worker_pool_;
+    // TODO(fdoray): Rename TaskRunner::RunsTaskOnCurrentThread() to something
+    // that reflects this behavior more accurately. crbug.com/646905
+    return sequence_->token() == SequenceToken::GetForCurrentThread();
   }
 
  private: