Storing BitmapInfo instead of icon and color directly in itemInfo

This will allow subclassing BitmapInfo to support custom icon/dynamic
icons which can be loaded on the background thread instead of going
through IconFactory which runs on UiThread

Change-Id: Ieced6e91330bdff1b505826d097a8df711dfe967

src/com/android/launcher3/FastBitmapDrawable.java

@@ -98,10 +98,6 @@ public class FastBitmapDrawable extends Drawable {
         this(info.icon, info.color);
     }
 
-    public FastBitmapDrawable(ItemInfoWithIcon info) {
-        this(info.iconBitmap, info.iconColor);
-    }
-
     protected FastBitmapDrawable(Bitmap b, int iconColor) {
         this(b, iconColor, false);
     }