Add routing id and notification type to accessibility logging.

content/renderer/render_view.cc

Index: content/renderer/render_view.cc
diff --git a/content/renderer/render_view.cc b/content/renderer/render_view.cc
index de09b3e397b07a85f4b917527705e8d4546ec424..cab2edc7fa692889678e8951ffb839b78f660132 100644
--- a/content/renderer/render_view.cc
+++ b/content/renderer/render_view.cc
@@ -1603,8 +1603,10 @@ void RenderView::SendPendingAccessibilityNotifications() {
 
 #ifndef NDEBUG
     if (accessibility_logging_) {
-      LOG(INFO) << "Accessibility update: \n"
-                << param.acc_obj.DebugString(true);
+      LOG(INFO) << "Accessibility update:\n"
+                << "(routing id: " << routing_id_ << " notification type: "
+                << ViewHostMsg_AccEvent::DebugString(param.notification_type)
+                << "\n" << param.acc_obj.DebugString(true);
     }
 #endif
   }