Adding missing file

core/src/main/scala/org/apache/spark/scheduler/AccumulableInfo.scala

@@ -0,0 +1,21 @@
+package org.apache.spark.scheduler
+
+import org.apache.spark.annotation.DeveloperApi
+
+/**
+ * :: DeveloperApi ::
+ * Information about an [[org.apache.spark.Accumulable]] modified during a task or stage.
+ */
+@DeveloperApi
+class AccumulableInfo (
+    val id: Long,
+    val name: String,
+    val update: Option[String], // represents a partial update within a task
+    val value: String) { }
+
+object AccumulableInfo {
+  def apply(id: Long, name: String, update: Option[String], value: String) =
+    new AccumulableInfo(id, name, update, value)
+
+  def apply(id: Long, name: String, value: String) = new AccumulableInfo(id, name, None, value)
+}