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/model/AddWorkspaceItemsTask.java

@@ -137,7 +137,7 @@ public class AddWorkspaceItemsTask extends BaseModelUpdateTask {
                                 .makeWorkspaceItem();
                         WorkspaceItemInfo wii = (WorkspaceItemInfo) itemInfo;
                         wii.title = "";
-                        wii.applyFrom(app.getIconCache().getDefaultIcon(item.user));
+                        wii.bitmap = app.getIconCache().getDefaultIcon(item.user);
                         app.getIconCache().getTitleAndIcon(wii,
                                 ((WorkspaceItemInfo) itemInfo).usingLowResIcon());
                     }