Refactor Clipboard Last Modified Time Storage

ui/android/junit/src/org/chromium/ui/base/ClipboardTest.java

-// 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.ui.base;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.robolectric.RuntimeEnvironment;
-import org.robolectric.annotation.Config;
-
-import org.chromium.base.ContextUtils;
-import org.chromium.base.metrics.RecordHistogram;
-import org.chromium.base.metrics.RecordUserAction;
-import org.chromium.testing.local.LocalRobolectricTestRunner;
-
-/**
- * Tests logic in the Clipboard class.
- */
-@RunWith(LocalRobolectricTestRunner.class)
-@Config(manifest = Config.NONE)
-public class ClipboardTest {
-    @BeforeClass
-    public static void beforeClass() {
-        RecordHistogram.setDisabledForTests(true);
-        RecordUserAction.setDisabledForTests(true);
-    }
-
-    @AfterClass
-    public static void afterClass() {
-        RecordHistogram.setDisabledForTests(false);
-        RecordUserAction.setDisabledForTests(false);
-    }
-
-    @Test
-    public void testGetClipboardContentChangeTimeInMillis() {
-        ContextUtils.initApplicationContext(RuntimeEnvironment.application);
-        // Upon launch, the clipboard should be at start of epoch, i.e., ancient.
-        Clipboard clipboard = Clipboard.getInstance();
-        assertEquals(0, clipboard.getClipboardContentChangeTimeInMillis());
-        // After updating the clipboard, it should have a new time.
-        clipboard.onPrimaryClipChanged();
-        assertTrue(clipboard.getClipboardContentChangeTimeInMillis() > 0);
-    }
-}