Adds initial Taskbar Edu implementation.

Currently it just pops up with one placeholder image for splitscreen.
The Next button doesn't do anything.

Screenshots:
Light: https://screenshot.googleplex.com/B27CwBcwobHTghN.png
Dark: https://screenshot.googleplex.com/48EuJZv8evd5RGW.png

Known issues:
 - Back gesture is picked up behind by the app behind the taskbar.
 - When the flag is enabled, the Edu shows up each time you open
   an app, rather than only the first time.

Bug: 180605356
Test: Manual
Change-Id: Ifba9aa59abf1501b5f8ddebb3fcc13df85f6efaa
diff --git a/src/com/android/launcher3/AbstractFloatingView.java b/src/com/android/launcher3/AbstractFloatingView.java
index 4979b40..e080537 100644
--- a/src/com/android/launcher3/AbstractFloatingView.java
+++ b/src/com/android/launcher3/AbstractFloatingView.java
@@ -64,7 +64,8 @@
             TYPE_OPTIONS_POPUP,
             TYPE_ICON_SURFACE,
             TYPE_PIN_WIDGET_FROM_EXTERNAL_POPUP,
-            TYPE_WIDGETS_EDUCATION_DIALOG
+            TYPE_WIDGETS_EDUCATION_DIALOG,
+            TYPE_TASKBAR_EDUCATION_DIALOG
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface FloatingViewType {}
@@ -87,18 +88,20 @@
 
     public static final int TYPE_PIN_WIDGET_FROM_EXTERNAL_POPUP = 1 << 14;
     public static final int TYPE_WIDGETS_EDUCATION_DIALOG = 1 << 15;
+    public static final int TYPE_TASKBAR_EDUCATION_DIALOG = 1 << 16;
 
     public static final int TYPE_ALL = TYPE_FOLDER | TYPE_ACTION_POPUP
             | TYPE_WIDGETS_BOTTOM_SHEET | TYPE_WIDGET_RESIZE_FRAME | TYPE_WIDGETS_FULL_SHEET
             | TYPE_ON_BOARD_POPUP | TYPE_DISCOVERY_BOUNCE | TYPE_TASK_MENU
             | TYPE_OPTIONS_POPUP | TYPE_SNACKBAR | TYPE_LISTENER | TYPE_ALL_APPS_EDU
             | TYPE_ICON_SURFACE | TYPE_DRAG_DROP_POPUP | TYPE_PIN_WIDGET_FROM_EXTERNAL_POPUP
-            | TYPE_WIDGETS_EDUCATION_DIALOG;
+            | TYPE_WIDGETS_EDUCATION_DIALOG | TYPE_TASKBAR_EDUCATION_DIALOG;
 
     // Type of popups which should be kept open during launcher rebind
     public static final int TYPE_REBIND_SAFE = TYPE_WIDGETS_FULL_SHEET
             | TYPE_WIDGETS_BOTTOM_SHEET | TYPE_ON_BOARD_POPUP | TYPE_DISCOVERY_BOUNCE
-            | TYPE_ALL_APPS_EDU | TYPE_ICON_SURFACE | TYPE_WIDGETS_EDUCATION_DIALOG;
+            | TYPE_ALL_APPS_EDU | TYPE_ICON_SURFACE | TYPE_WIDGETS_EDUCATION_DIALOG
+            | TYPE_TASKBAR_EDUCATION_DIALOG;
 
     // Usually we show the back button when a floating view is open. Instead, hide for these types.
     public static final int TYPE_HIDE_BACK_BUTTON = TYPE_ON_BOARD_POPUP | TYPE_DISCOVERY_BOUNCE