Add DumpAccessibilityEvents test framework.

content/browser/accessibility/accessibility_event_recorder.cc

+// 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.
+
+#include "base/port.h"
+#include "content/browser/accessibility/accessibility_event_recorder.h"
+
+namespace content {
+
+AccessibilityEventRecorder::AccessibilityEventRecorder(
+    BrowserAccessibilityManager* manager)
+    : manager_(manager) {
+}
+
+AccessibilityEventRecorder::~AccessibilityEventRecorder() {
+}
+
+#if !defined(OS_WIN)
+// static
+AccessibilityEventRecorder* AccessibilityEventRecorder::Create(
+    BrowserAccessibilityManager* manager) {
+  return new AccessibilityEventRecorder(manager);
+}
+#endif
+
+}  // namespace content