Multiprocess test client: Android child process launcher rework.

base/test/android/java/src/org/chromium/base/FileDescriptorInfo.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.base;
+
+import android.annotation.SuppressLint;
+import android.os.Parcel;
+import android.os.ParcelFileDescriptor;
+import android.os.Parcelable;
+
+/**
+ * Parcelable class that contains file descriptor and an ID.
+ * TODO(jcivelli): should be merged with
+ * org.chromium.content.common.FileDescriptorInfo
+ */
+@SuppressLint("ParcelClassLoader")
+public final class FileDescriptorInfo implements Parcelable {
+    /** An consumer chosen ID that uniquely identifies a file descriptor. */
+    public final int id;

[Robert Sesek, 2016/12/20 20:44:34]

Since the base C++ calls this "key" -- why not do the same? That'd help a little
bit with "fd" and "id" having only 1/2 characters difference.

[Jay Civelli, 2016/12/20 23:07:26]

Good idea, done.

+
+    /** A file descriptor to access the file. */
+    public final ParcelFileDescriptor fd;
+
+    public FileDescriptorInfo(int id, ParcelFileDescriptor fd) {
+        this.id = id;
+        this.fd = fd;
+    }
+
+    FileDescriptorInfo(Parcel in) {
+        id = in.readInt();
+        fd = in.readParcelable(null);
+    }
+
+    @Override
+    public int describeContents() {
+        return CONTENTS_FILE_DESCRIPTOR;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(id);
+        dest.writeParcelable(fd, CONTENTS_FILE_DESCRIPTOR);
+    }
+
+    public static final Parcelable.Creator<FileDescriptorInfo> CREATOR =
+            new Parcelable.Creator<FileDescriptorInfo>() {
+                @Override
+                public FileDescriptorInfo createFromParcel(Parcel in) {
+                    return new FileDescriptorInfo(in);
+                }
+
+                @Override
+                public FileDescriptorInfo[] newArray(int size) {
+                    return new FileDescriptorInfo[size];
+                }
+            };
+}