Make Talkback anounce which page is the icon being move on.

Adding a third argument for the talkback string.

Fix: 230593493
Test: Move an item using Talkback and it should mention the row,
column and page where you can drop the item.

Change-Id: Id3d4435e9ef3348278643e6e2a1cd1e8bf5157b7
diff --git a/src/com/android/launcher3/CellLayout.java b/src/com/android/launcher3/CellLayout.java
index 300e7bf..52dfcd4 100644
--- a/src/com/android/launcher3/CellLayout.java
+++ b/src/com/android/launcher3/CellLayout.java
@@ -1202,13 +1202,14 @@
             int row = cellY + 1;
             int col = workspace.mIsRtl ? mCountX - cellX : cellX + 1;
             int panelCount = workspace.getPanelCount();
+            int screenId = workspace.getIdForScreen(this);
+            int pageIndex = workspace.getPageIndexForScreenId(screenId);
             if (panelCount > 1) {
                 // Increment the column if the target is on the right side of a two panel home
-                int screenId = workspace.getIdForScreen(this);
-                int pageIndex = workspace.getPageIndexForScreenId(screenId);
                 col += (pageIndex % panelCount) * mCountX;
             }
-            return getContext().getString(R.string.move_to_empty_cell, row, col);
+            return getContext().getString(R.string.move_to_empty_cell_description, row, col,
+                    workspace.getPageDescription(pageIndex));
         }
     }