Add WebAPK's tests in ChildProcessLauncherTest.

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

Index: content/public/test/android/javatests/src/org/chromium/content/browser/test/ChildProcessLauncherTestHelper.java
diff --git a/content/public/test/android/javatests/src/org/chromium/content/browser/test/ChildProcessLauncherTestHelper.java b/content/public/test/android/javatests/src/org/chromium/content/browser/test/ChildProcessLauncherTestHelper.java
new file mode 100644
index 0000000000000000000000000000000000000000..59560b8209bdd6d2d9a4f10ae0178e2004092d3d
--- /dev/null
+++ b/content/public/test/android/javatests/src/org/chromium/content/browser/test/ChildProcessLauncherTestHelper.java
@@ -0,0 +1,36 @@
+// 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.content.browser.test;
+
+import android.app.Service;
+import android.content.Context;
+
+import org.chromium.base.library_loader.LibraryProcessType;
+import org.chromium.content.browser.ChildProcessCreationParams;
+import org.chromium.content.browser.ChildProcessLauncher;
+
+/**
+ * A helper class for {@link ChildProcessLauncherTest} and its subclass
+ * {@link ChromeChildProcessLauncherTest}.
+ */
+public class ChildProcessLauncherTestHelper {
+
+    /**
+     * Returns the number of Chrome's sandboxed connections.
+     */
+    public static int allocatedChromeSandboxedConnectionsCount(Context context) {
+        return ChildProcessLauncher.allocatedSandboxedConnectionsCountForTesting(
+                context, context.getPackageName());
+    }
+
+    /**
+     *  Returns a {@link ChildProcessCreationParams} for the given package name and service name.
+     */
+    public static ChildProcessCreationParams getChildProcessCreationParams(String packageName,
+            Class<? extends Service> serviceName) {
+        return new ChildProcessCreationParams(packageName, 0,
+                LibraryProcessType.PROCESS_CHILD, serviceName);
+    }
+}