Adds WW logging for QSB search results & all-apps predicted row.

SearchResultContainer represents apps rows displayed within QSB search results for both default scenario(without search term) and actual search result(with search term).

SearchResultContainer is used for both homescreen QSB and all-apps QSB.

Follow up CLs will add searchOrigin and queryLength in SearchResultContainer

Bug: 152978018
Change-Id: Id5f96490686c4141e3e6b2516907ac0505a777e6

src/com/android/launcher3/Workspace.java

@@ -418,10 +418,10 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
         mStatsLogManager.log(
                 LauncherEvent.LAUNCHER_ITEM_DRAG_STARTED,
                 dragObject.logInstanceId,
-                dragObject.originalDragInfo.buildProto(
-                    dragObject.dragSource instanceof Folder
-                        ? ((Folder) dragObject.dragSource).mInfo
-                        : null)
+                dragObject.dragSource instanceof Folder
+                        ? dragObject.originalDragInfo
+                                .buildProto(((Folder) dragObject.dragSource).mInfo)
+                        : dragObject.originalDragInfo.buildProto()
         );
     }