Fullscreen pages (e.g. Now) are focusable via keyboard.

Change-Id: I962551651aeb9ac7b57bb51b195adc3140db30d8

src/com/android/launcher3/Workspace.java

@@ -651,6 +651,8 @@ public class Workspace extends PagedView
             parent.removeView(customContent);
         }
         customScreen.removeAllViews();
+        customContent.setFocusable(true);
+        customContent.setOnKeyListener(new FullscreenKeyEventListener());
         customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
         mCustomContentDescription = description;