Support ChildProcessAllocatorSettings in JUnit4 tests

content/public/test/android/javatests/src/org/chromium/content/browser/test/ContentJUnit4ClassRunner.java

Index: content/public/test/android/javatests/src/org/chromium/content/browser/test/ContentJUnit4ClassRunner.java
diff --git a/content/public/test/android/javatests/src/org/chromium/content/browser/test/ContentJUnit4ClassRunner.java b/content/public/test/android/javatests/src/org/chromium/content/browser/test/ContentJUnit4ClassRunner.java
new file mode 100644
index 0000000000000000000000000000000000000000..8581532e0c9f40b925dec8ed462f7eeaad04a858
--- /dev/null
+++ b/content/public/test/android/javatests/src/org/chromium/content/browser/test/ContentJUnit4ClassRunner.java
@@ -0,0 +1,37 @@
+// 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.content.browser.test;
+
+import org.junit.runners.model.InitializationError;
+
+import org.chromium.base.test.BaseJUnit4ClassRunner;
+import org.chromium.base.test.BaseTestResult.PreTestHook;
+import org.chromium.base.test.util.CommandLineFlags;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * A custom runner for //content JUnit4 tests.
+ */
+public class ContentJUnit4ClassRunner extends BaseJUnit4ClassRunner {
+    /**
+     * Create a ContentJUnit4ClassRunner to run {@code klass} and initialize values
+     *
+     * @throws InitializationError if the test class malformed
+     */
+    public ContentJUnit4ClassRunner(final Class<?> klass) throws InitializationError {
+        super(klass, null, defaultPreTestHooks());
+    }
+
+    /**
+     * Change this static function to add default {@code PreTestHook}s.
+     */
+    private static List<PreTestHook> defaultPreTestHooks() {
+        return Arrays.asList(new PreTestHook[] {
+            CommandLineFlags.getRegistrationHook(),
+            new ChildProcessAllocatorSettingsHook()});
+    }
+}