Facebook appears to be testing an important change in its app. Several users of the Facebook app have seen a dedicated WhatsApp button button on the app.This shows that the social networking giant may be running trials for integrating the WhatsApp into its Facebook app. According to a report in WhatsApp, the button will function as a shortcut and a click on it will open user’s WhatsApp without leaving the Facebook app. In the screenshot shared by the TheNextWeb, the button is placed in the menu area of the app. The report claims that users found the WhatsApp shortcut button when they switched the language settings in the Facebook app. This is not the first time that the company is testing this kind of a feature. In 2015, Facebook tried incorporating a WhatsApp send button in the Facebook app, which would enable the users to share photos with their contacts without leaving the app. But, the feature was never rolled out for public. Earlier this week, it was reported that WhatsApp is rolling out new feature — presently in Android beta — which will enable users to manage the storage on their smartphones. The feature is already available for iOS users and will give a detailed break-up of the space consumed by various chats on their smartphones. In order to use the feature, Android beta testers have to go to Settings> Data and Storage usage> Storage usage. When a user will tap on storage usage, then they will have to wait for the app to load all the chat conversations. After this, the app will then show the amount of space occupied by each chat. Along with this, the feature will also tell users which group or individual chat is occupying maximum storage.