Add verbose logging for native accessibility events.

content/browser/accessibility/browser_accessibility_manager_auralinux.cc

 // Copyright (c) 2015 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 "content/browser/accessibility/browser_accessibility_manager_auralinux.h"
 
 #include "content/browser/accessibility/browser_accessibility_auralinux.h"
 #include "content/common/accessibility_messages.h"
 
 namespace content {
@@ skipping 32 matching lines @@
   empty_document.id = 0;
   empty_document.role = ui::AX_ROLE_ROOT_WEB_AREA;
   empty_document.state = 1 << ui::AX_STATE_READ_ONLY;
   ui::AXTreeUpdate update;
   update.root_id = empty_document.id;
   update.nodes.push_back(empty_document);
   return update;
 }
 
 void BrowserAccessibilityManagerAuraLinux::NotifyAccessibilityEvent(
+    BrowserAccessibilityEvent::Source source,
     ui::AXEvent event_type,
     BrowserAccessibility* node) {
   // TODO(shreeram.k) : Implement.
 }
 
 }  // namespace content