content_shell: Create the FIFOs needed for running Android layout tests

content/shell/android/java/src/org/chromium/content_shell/ShellLayoutTestUtils.java

+// Copyright 2013 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_shell;
+
+import android.content.Context;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+/**
+ * Utility methods used by content_shell for running Blink's layout tests on Android.
+ */
+@JNINamespace("content")
+class ShellLayoutTestUtils {
+    /**
+     * @return The directory in which the test files, for example FIFOs, can be stored.
+     */
+    @SuppressWarnings("unused")
+    @CalledByNative
+    private static String getApplicationFilesDirectory(Context appContext) {
+        return appContext.getFilesDir().getAbsolutePath();
+    }
+}