Add content description to screensaver customization button

This will let users know which screensaver they are customizing.

Fixes: 267582102
Test: flashed device and enabled talkback, opened screensaver settings,
and verified talkback correctly says the name of the screensaver

Change-Id: I9d0d9422f06b7a78efca0e6953b73fe612f79e2a

src/com/android/settings/dream/DreamAdapter.java

@@ -129,6 +129,9 @@ public class DreamAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
                 // This must be called AFTER itemView.setSelected above, in order to keep the
                 // customize button in an unselected state.
                 mCustomizeButton.setSelected(false);
+                mCustomizeButton.setContentDescription(
+                        mContext.getResources().getString(R.string.customize_button_description,
+                                item.getTitle()));
             }
 
             setEnabledStateOnViews(itemView, mEnabled);