AppShare: Added check to see if additional back press is required.

On some devices after signing into skype, the back button press only
hides the keyboard and a second is required to return to the previous
app.

wlauto/workloads/appshare/uiauto/src/com/arm/wlauto/uiauto/UiAutomation.java

@@ -60,6 +60,14 @@ public class UiAutomation extends UxPerfUiAutomation {
         // Skype won't allow us to login and share on first visit so invoke
         // once more from googlephotos
         pressBack();
+
+        // On some devices the first back press only hides the keyboard, check if
+        // another is needed.
+        UiObject googlephotosShare = new UiObject(new UiSelector().packageName(
+                                      parameters.getString("googlephotos_package")));
+        if (!googlephotosShare.exists()){
+            pressBack();
+        }
         sendToSkype(contactName);
 
         unsetScreenOrientation();