Googleplaybooks: Adding support for night reading dialogues.

Certain devices present a night time reading popup alert when opening the books workload.
This can throw off the workload so I've added a function to check for this and dismiss if neccessary.

wa/workloads/googleplaybooks/uiauto/app/src/main/java/com/arm/wa/uiauto/googleplaybooks/UiAutomation.java

@@ -617,6 +617,8 @@ public class UiAutomation extends BaseUiAutomation implements ApplaunchInterface
         // becomes visible on the screen. Therefore add pause instead.
         sleep(3);
 
+        dismissNightLight();
+
         if (!activityReader.waitForExists(viewTimeout)) {
             throw new UiObjectNotFoundException("Could not find \"activity reader view\".");
         }
@@ -692,4 +694,12 @@ public class UiAutomation extends BaseUiAutomation implements ApplaunchInterface
         }
         return page;
     }
+
+    private void dismissNightLight() throws Exception {
+        UiObject night = 
+            mDevice.findObject(new UiSelector().text("Night Light makes reading easy"));
+        if (night.exists()) {
+            clickUiObject(BY_TEXT, "DISMISS");
+        }
+    }
 }