Add xTaskGetApplicationTaskTag() prototype.

Source/include/task.h

@@ -955,6 +955,14 @@ unsigned portBASE_TYPE uxTaskGetStackHighWaterMark( xTaskHandle xTask );
  */
 void vTaskSetApplicationTaskTag( xTaskHandle xTask, pdTASK_HOOK_CODE pxHookFunction );
 
+/**
+ * task.h
+ * <pre>void xTaskGetApplicationTaskTag( xTaskHandle xTask );</pre>
+ *
+ * Returns the pxHookFunction value assigned to the task xTask.
+ */
+pdTASK_HOOK_CODE xTaskGetApplicationTaskTag( xTaskHandle xTask );
+
 /**
  * task.h
  * <pre>portBASE_TYPE xTaskCallApplicationTaskHook( xTaskHandle xTask, pdTASK_HOOK_CODE pxHookFunction );</pre>