COMPMID-3391: Implement Async interfaces

Change-Id: I8168cea5056ff48a0253ebb8c88ea549a3ea69a2
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/3335
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/arm_compute/runtime/SingleThreadScheduler.h b/arm_compute/runtime/SingleThreadScheduler.h
index 3f279eb..8094758 100644
--- a/arm_compute/runtime/SingleThreadScheduler.h
+++ b/arm_compute/runtime/SingleThreadScheduler.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2019 ARM Limited.
+ * Copyright (c) 2017-2020 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -50,6 +50,14 @@
      * @param[in] hints  Hints for the scheduler.
      */
     void schedule(ICPPKernel *kernel, const Hints &hints) override;
+    /** Runs the kernel in the same thread as the caller synchronously.
+     *
+     * @param[in] kernel  Kernel to execute.
+     * @param[in] hints   Hints for the scheduler.
+     * @param[in] inputs  Vector containing the input tensors.
+     * @param[in] outputs Vector containing the output tensors.
+     */
+    void schedule_op(ICPPKernel *kernel, const Hints &hints, std::vector<InputOperatorTensors *> &inputs, std::vector<OutputOperatorTensors *> &outputs) override;
 
 protected:
     /** Will run the workloads sequentially and in order.