Change RequestFinishedListener to provide executor

components/cronet/android/api/src/org/chromium/net/RequestFinishedListener.java

Index: components/cronet/android/api/src/org/chromium/net/RequestFinishedListener.java
diff --git a/components/cronet/android/api/src/org/chromium/net/RequestFinishedListener.java b/components/cronet/android/api/src/org/chromium/net/RequestFinishedListener.java
new file mode 100644
index 0000000000000000000000000000000000000000..764aa05e6a17e61727d8977109cdd338d2ced103
--- /dev/null
+++ b/components/cronet/android/api/src/org/chromium/net/RequestFinishedListener.java
@@ -0,0 +1,38 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.net;
+
+import java.util.concurrent.Executor;
+
+/**
+ * Listens for finished requests for the purpose of collecting metrics.
+ *
+ * {@hide} as it's a prototype.
+ */
+public abstract class RequestFinishedListener {
+    private final Executor mExecutor;
+
+    public RequestFinishedListener(Executor executor) {
+        if (executor == null) {
+            throw new IllegalStateException("Executor must not be null");
+        }
+        mExecutor = executor;
+    }
+
+    /**
+     * Invoked with request info. Will be called in a task submitted to the
+     * {@link java.util.concurrent.Executor} returned by {@link #getExecutor}.
+     * @param requestInfo {@link CronetEngine#UrlRequestInfo} for finished request.
+     */
+    public abstract void onRequestFinished(CronetEngine.UrlRequestInfo requestInfo);
+
+    /**
+     * Returns this listener's executor. Can be called on any thread.
+     * @return this listener's {@link java.util.concurrent.Executor}
+     */
+    public Executor getExecutor() {
+        return mExecutor;
+    }
+}