Merge "Temporarily going home from an app via device.pressHome" into ub-launcher3-master

                log(action = "0-button: from another app");

                assertTrue("Launcher is visible, don't know how to go home",

                        !mDevice.hasObject(By.pkg(getLauncherPackageName())));

                final UiObject2 navBar = waitForSystemUiObject("navigation_bar_frame");

                swipe(

                        navBar.getVisibleBounds().centerX(), navBar.getVisibleBounds().centerY(),

                        navBar.getVisibleBounds().centerX(), 0,

                        BACKGROUND_APP_STATE_ORDINAL, ZERO_BUTTON_STEPS_FROM_BACKGROUND_TO_HOME);

                mDevice.pressHome();

            }

        } else {

            log(action = "clicking home button");