Changing SpawnChild to return a struct.

base/android/java/src/org/chromium/base/IParcelableChannel.aidl

Index: base/android/java/src/org/chromium/base/IParcelableChannel.aidl
diff --git a/base/android/java/src/org/chromium/base/IParcelableChannel.aidl b/base/android/java/src/org/chromium/base/IParcelableChannel.aidl
new file mode 100644
index 0000000000000000000000000000000000000000..5d0f3270633635f7fe151fef773d33926d793d6f
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/IParcelableChannel.aidl
@@ -0,0 +1,14 @@
+// Copyright 2017 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.base;
+
+import org.chromium.base.ParcelableWrapper;
+
+/**
+ * This interface is used to send Java parcelable objects to child processes.
+ */
+interface IParcelableChannel {
+  void sendParcelable(in ParcelableWrapper parcelableValue);
+}