Convert MultiActivityTestBase children to JUnit4

chrome/test/android/javatests/src/org/chromium/chrome/test/MultiActivityTestCommon.java

Index: chrome/test/android/javatests/src/org/chromium/chrome/test/MultiActivityTestCommon.java
diff --git a/chrome/test/android/javatests/src/org/chromium/chrome/test/MultiActivityTestCommon.java b/chrome/test/android/javatests/src/org/chromium/chrome/test/MultiActivityTestCommon.java
new file mode 100644
index 0000000000000000000000000000000000000000..576777e99369433a407a0bc24045c410a22ee739
--- /dev/null
+++ b/chrome/test/android/javatests/src/org/chromium/chrome/test/MultiActivityTestCommon.java
@@ -0,0 +1,68 @@
+// 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.chrome.test;
+
+import android.app.Instrumentation;
+import android.content.Context;
+import android.text.TextUtils;
+
+import org.chromium.base.metrics.RecordHistogram;
+import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModelSelector;
+import org.chromium.chrome.test.util.ApplicationTestUtils;
+import org.chromium.chrome.test.util.browser.tabmodel.document.MockStorageDelegate;
+import org.chromium.content.browser.test.util.Criteria;
+import org.chromium.content.browser.test.util.CriteriaHelper;
+
+// TODO(yolandyan): move this class to its test rule once JUnit4 migration is over
+final class MultiActivityTestCommon {
+    private final MultiActivityTestCommonCallback mCallback;
+    MockStorageDelegate mStorageDelegate;
+    Context mContext;
+
+    MultiActivityTestCommon(MultiActivityTestCommonCallback callback) {
+        mCallback = callback;
+    }
+
+    void setUp() throws Exception {
+        RecordHistogram.setDisabledForTests(true);
+        mContext = mCallback.getInstrumentation().getTargetContext();
+        ApplicationTestUtils.setUp(mContext, true);
+
+        // Make the DocumentTabModelSelector use a mocked out directory so that test runs don't
+        // interfere with each other.
+        mStorageDelegate = new MockStorageDelegate(mContext.getCacheDir());
+        DocumentTabModelSelector.setStorageDelegateForTests(mStorageDelegate);
+    }
+
+    void tearDown() throws Exception {
+        mStorageDelegate.ensureDirectoryDestroyed();
+        ApplicationTestUtils.tearDown(mContext);
+        RecordHistogram.setDisabledForTests(false);
+    }
+
+    void waitForFullLoad(final ChromeActivity activity, final String expectedTitle) {
+        waitForFullLoad(activity, expectedTitle, false);
+    }
+
+    void waitForFullLoad(
+            final ChromeActivity activity, final String expectedTitle, boolean waitLongerForLoad) {
+        ApplicationTestUtils.assertWaitForPageScaleFactorMatch(activity, 0.5f, waitLongerForLoad);
+        final Tab tab = activity.getActivityTab();
+        assert tab != null;
+
+        CriteriaHelper.pollUiThread(new Criteria() {
+            @Override
+            public boolean isSatisfied() {
+                if (!tab.isLoadingAndRenderingDone()) return false;
+                if (!TextUtils.equals(expectedTitle, tab.getTitle())) return false;
+                return true;
+            }
+        });
+    }
+
+    public interface MultiActivityTestCommonCallback { Instrumentation getInstrumentation(); }
+}