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..ee84a37b092acdb705a92bedf41172c68cc6eb68
--- /dev/null
+++ b/content/public/test/android/javatests/src/org/chromium/content/browser/test/ChildProcessLauncherTestHelper.java
@@ -0,0 +1,74 @@
+// 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.LibraryLoader;
+import org.chromium.base.library_loader.LibraryProcessType;
+import org.chromium.content.browser.ChildProcessConnectionImpl;
+import org.chromium.content.browser.ChildProcessCreationParams;
+import org.chromium.content.browser.ChildProcessLauncher;
+import org.chromium.content.browser.test.util.Criteria;
+import org.chromium.content.browser.test.util.CriteriaHelper;
+
+/**
+ * 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 whether the connection is established and connected.
+     */
+    public static ChildProcessConnectionImpl startConnection(Context context, String packageName,
+            Class<? extends Service> servicecClass)
+            throws InterruptedException {
+        // Allocate a new connection.
+        final ChildProcessConnectionImpl connection =
+                (ChildProcessConnectionImpl) ChildProcessLauncher.allocateBoundConnectionForTesting(
+                        context,
+                        ChildProcessLauncherTestHelper.getChildProcessCreationParams(
+                                packageName, servicecClass));
+
+        if (connection == null) {
+            return null;
+        }
+        // Wait for the service to connect.
+        CriteriaHelper.pollInstrumentationThread(
+                new Criteria("The connection wasn't established.") {
+                    @Override
+                    public boolean isSatisfied() {
+                        return connection.isConnected();
+                    }
+                });
+        return connection;
+    }
+
+    /**
+     *  Returns a {@link ChildProcessCreationParams} for the given package name and service name.
+     */
+    public static ChildProcessCreationParams getChildProcessCreationParams(String packageName,
+            Class<? extends Service> serviceClass) {
+        return new ChildProcessCreationParams(packageName, 0,
+                LibraryProcessType.PROCESS_CHILD, serviceClass);
+    }
+
+    /**
+     * Loads and initialize the library if necessary.
+     */
+    public static void ensureLibraryInitialized(Context context) throws Exception {
+        LibraryLoader.get(LibraryProcessType.PROCESS_CHILD).ensureInitialized(context);
+    }
+}