[Android] Workaround of an android platform bug.

base/android/javatests/src/org/chromium/base/LibraryLoaderHelperTest.java

+// Copyright 2014 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.base;
+
+import android.content.Context;
+import android.test.InstrumentationTestCase;
+import android.test.suitebuilder.annotation.MediumTest;
+
+import org.chromium.base.library_loader.LibraryLoaderHelper;
+
+import java.io.File;
+
+/**
+ * Test class for the native library hack.
+ */
+public class LibraryLoaderHelperTest extends InstrumentationTestCase {
+    private static final String TAG = "LibraryLoaderHelperTest";
+
+    @Override
+    public void setUp() throws Exception {
+        Context context = getInstrumentation().getTargetContext();
+        LibraryLoaderHelper.deleteWorkaroundLibrariesSynchronously(context);
+    }
+
+    @MediumTest
+    public void testLoadNativeLibraries() {
+        getInstrumentation().runOnMainSync(new Runnable() {
+            @Override
+            public void run() {
+                Context context = getInstrumentation().getTargetContext();
+                File libDir = LibraryLoaderHelper.getWorkaroundLibDir(context);
+                assertTrue(libDir.exists());
+                assertTrue(libDir.isDirectory());
+                assertEquals(libDir.list().length, 0);
+
+                assertTrue(
+                    LibraryLoaderHelper.loadNativeLibrariesUsingWorkaroundForTesting(
+                        context));
+
+                assertTrue(libDir.list().length > 0);
+            }
+        });
+    }
+
+    @Override
+    public void tearDown() throws Exception {
+        Context context = getInstrumentation().getTargetContext();
+        LibraryLoaderHelper.deleteWorkaroundLibrariesSynchronously(context);
+        super.tearDown();
+    }
+}