Add separate background colors to each popup container child.

- Colors interpolate between the primary and secondary popup colors
- Removed condensed height and icon scale

Bug: 175329686
Test: visual, manual checking apps with different shortcut options
Change-Id: I064c329dc8ad3ae6f408056c74372cca3ce20b68

src/com/android/launcher3/notification/NotificationItemView.java

@@ -92,6 +92,10 @@ public class NotificationItemView {
         });
     }
 
+    public void updateBackgroundColor(int color) {
+        mMainView.updateBackgroundColor(color);
+    }
+
     public void addGutter() {
         if (mGutter == null) {
             mGutter = mPopupContainer.inflateAndAdd(R.layout.notification_gutter, mRootView);