Added test for findbugs plugin.

tools/android/findbugs_plugin/test/java/src/org/chromium/tools/findbugs/plugin/SimpleSynchronizedThis.java

Index: tools/android/findbugs_plugin/test/java/src/org/chromium/tools/findbugs/plugin/SimpleSynchronizedThis.java
diff --git a/tools/android/findbugs_plugin/test/java/src/org/chromium/tools/findbugs/plugin/SimpleSynchronizedThis.java b/tools/android/findbugs_plugin/test/java/src/org/chromium/tools/findbugs/plugin/SimpleSynchronizedThis.java
new file mode 100644
index 0000000000000000000000000000000000000000..2c7e6fdfb4b5ec6bf209550d7036bae3512df231
--- /dev/null
+++ b/tools/android/findbugs_plugin/test/java/src/org/chromium/tools/findbugs/plugin/SimpleSynchronizedThis.java
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 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.tools.findbugs.plugin;
+
+/**
+ * This class has synchronized(this) statement and is used to test
+ * SynchronizedThisDetector.
+ */
+class SimpleSynchronizedThis {
+  private int i = 0;
+
+  void synchronizedThis() {
+    synchronized(this) {
+      i++;
+    }
+  }
+}