[Sync] Move //sync to //components/sync.

sync/test/android/javatests/src/org/chromium/sync/test/util/SimpleFuture.java

-// Copyright 2015 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.sync.test.util;
-
-import org.chromium.base.Callback;
-
-/**
- * A simple tool to make waiting for the result of an asynchronous operation easy.
- *
- * This class is thread-safe; the result can be provided and retrieved on any thread.
- *
- * Example usage:
- *
- *    final SimpleFuture<Integer> future = new SimpleFuture<Integer>();
- *    getValueAsynchronously(new Callback<Integer>() {
- *        public void onResult(Integer result) {
- *            // Do some other work...
- *            future.provide(result);
- *        }
- *    }
- *    int value = future.get();
- *
- * Or, if your callback doesn't need to do anything but provide the value:
- *
- *    SimpleFuture<Integer> result = new SimpleFuture<Integer>();
- *    getValueAsynchronously(result.createCallback());
- *    int value = result.get();
- *
- * @param <V> The type of the value this future will return.
- */
-public class SimpleFuture<V> {
-    private static final int GET_TIMEOUT_MS = 10000;
-
-    private final Object mLock = new Object();
-    private boolean mHasResult = false;
-    private V mResult;
-
-    /**
-     * Provide the result value of this future for get() to return.
-     *
-     * Any calls after the first are ignored.
-     */
-    public void provide(V result) {
-        synchronized (mLock) {
-            if (mHasResult) {
-                // You can only provide a result once.
-                return;
-            }
-            mHasResult = true;
-            mResult = result;
-            mLock.notifyAll();
-        }
-    }
-
-    /**
-     * Get the value of this future, or block until it's available.
-     */
-    public V get() throws InterruptedException {
-        synchronized (mLock) {
-            while (!mHasResult) {
-                mLock.wait(GET_TIMEOUT_MS);
-            }
-            return mResult;
-        }
-    }
-
-    /**
-     * Helper function to create a {@link Callback} that will provide its result.
-     */
-    public Callback<V> createCallback() {
-        return new Callback<V>() {
-            @Override
-            public void onResult(V result) {
-                provide(result);
-            }
-        };
-    }
-}