Allow direct executors in cronet.

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

+// 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.RejectedExecutionException;
+
+/**
+ * Thrown when an executor runs a submitted runnable inline in {@link
+ * java.util.concurrent.Executor#execute(Runnable)}.
+ */
+public final class InlineExecutionProhibitedException extends RejectedExecutionException {

[mef, 2016/09/01 15:17:18]

nit: Maybe call it DirectExecutionProhibitedException to match
AllowDirectExecutor flag?

[Charles, 2016/09/01 16:45:24]

I named it this because people encountering this exception aren't likely to know
what a direct executor is - they'll probably hit this by writing one themselves,
or using caller_runs_policy.

+    public InlineExecutionProhibitedException() {
+        super("Inline execution is prohibited for this request");
+    }
+}