[Android] Implement Widgets on Android

[anthonypkeane]

Description

Please implement Widgets on Android.

Details can be found in the "Mobile Widgets" doc on G-Drive

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.17.71 x64 RC build

• Verified on a clean install NTP shows widgets
• Verified default widget is privacy stats
• Verified Privacy Stats/Favourites/Binance is the order of widget stack
• Verified able to scroll up or down on the widget stack
• Verified widget can be added/removed by selecting Remove widget via widget menu
• Verified widget can be added/removed by selecting Edit Stack via widget menu
• Verified tapping on Edit Stack opens up settings for widget stack
• Verified left/right swipe on widget stack settings removes the specific widget
• Verified clicking on the + button next to the widget adds it at the bottom of the widget stack
• Verified widget order can be changed by moving the entry within the widget stack
• Verified removing all widgets in the stack doesn't leave a widget container window
• Verified when the device is set to non-EN locale, widget text doesn't overflow or gets cut off.
• Verified changing device orientation doesn't stretch widgets. Changing orientation sets the widget to the top right corner of NTP
• Verified on landscape mode, the widget doesn't overlap on the NTP SI links
• Verified stats are retained on upgrade from 1.16.x and tapping on privacy stats brings up the bottom sheet report
• Verified clicking on favourites from upgrade loads the site correctly
• Verified able to delete top sites from the widget on both clean install and upgrade
• Verified changing bottom toolbar behaviour doesn't mess up with the widget location

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Verification passed on Samsung Tab A with Android 10 running 1.17.71 x64 RC build

• Verified on a clean install NTP shows widgets
• Verified default widget is privacy stats
• Verified Privacy Stats/Favourites/Binance is the order of widget stack
• Verified able to scroll up or down on the widget stack
• Verified widget can be added/removed by selecting Remove widget via widget menu
• Verified widget can be added/removed by selecting Edit Stack via widget menu
• Verified tapping on Edit Stack opens up settings for widget stack
• Verified left/right swipe on widget stack settings removes the specific widget
• Verified clicking on the + button next to the widget adds it at the bottom of the widget stack
• Verified widget order can be changed by moving the entry within the widget stack
• Verified removing all widgets in the stack doesn't leave a widget container window
• Verified when the device is set to non-EN locale, widget text doesn't overflow or gets cut off.
• Verified changing device orientation doesn't stretch widgets. Changing orientation sets the widget to the top right corner of NTP
• Verified on landscape mode, the widget doesn't overlap on the NTP SI links
• Verified stats are retained on upgrade from 1.16.x and tapping on privacy stats brings up the bottom sheet report
• Verified clicking on favourites from upgrade loads the site correctly
• Verified able to delete top sites from the widget on both clean install and upgrade