Add DumpAccessibilityEvents test framework.

content/browser/accessibility/accessibility_event_recorder.h

+// 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.
+
+#ifndef CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EVENT_RECORDER_H_
+#define CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EVENT_RECORDER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class BrowserAccessibilityManager;
+
+// Listens for native accessibility events fired by a given
+// BrowserAccessibilityManager and saves human-readable log strings for
+// each event fired to a vector. Construct an instance of this class to
+// begin listening, call GetEventLogs() to get all of the logs so far, and
+// destroy it to stop listening.
+//
+// A log string should be of the form "<event> on <node>" where <event> is
+// the name of the event fired (platform-specific) and <node> is information
+// about the accessibility node on which the event was fired, for example its
+// role and name.
+//
+// The implementation is highly platform-specific; a subclass is needed for
+// each platform does most of the work.
+class AccessibilityEventRecorder {
+ public:
+  // Construct the right platform-specific subclass.
+  static AccessibilityEventRecorder* Create(
+      BrowserAccessibilityManager* manager);
+  virtual ~AccessibilityEventRecorder();
+
+  // Access the vector of human-readable event logs, one string per event.
+  const std::vector<std::string>& event_logs() { return event_logs_; }
+
+ protected:
+  explicit AccessibilityEventRecorder(BrowserAccessibilityManager* manager);
+
+  BrowserAccessibilityManager* manager_;
+  std::vector<std::string> event_logs_;
+
+  DISALLOW_COPY_AND_ASSIGN(AccessibilityEventRecorder);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EVENT_RECORDER_H_