Fix PopupWindowTest#testShowAtLocation to Support 0 Padding

Bug 2941912

Change the assertion that depended upon the popup window's theme
having > 0 padding. Removing the PopupWindow theme's background to
simulate a lack of padding causes this test to fail unless the
assertions allow zero padding.

Change-Id: I9e2aae710526182b03b9637a29c75cf01c9cbc4d
diff --git a/tests/tests/widget/src/android/widget/cts/PopupWindowTest.java b/tests/tests/widget/src/android/widget/cts/PopupWindowTest.java
index 542eddc..335c406 100644
--- a/tests/tests/widget/src/android/widget/cts/PopupWindowTest.java
+++ b/tests/tests/widget/src/android/widget/cts/PopupWindowTest.java
@@ -443,8 +443,8 @@
         assertTrue(mPopupWindow.isShowing());
         mPopupWindow.getContentView().getLocationInWindow(viewInWindowXY);
         mPopupWindow.getContentView().getLocationOnScreen(viewOnScreenXY);
-        assertTrue(viewInWindowXY[0] > 0);
-        assertTrue(viewInWindowXY[1] > 0);
+        assertTrue(viewInWindowXY[0] >= 0);
+        assertTrue(viewInWindowXY[1] >= 0);
         assertEquals(viewInWindowXY[0] + xOff, viewOnScreenXY[0]);
         assertEquals(viewInWindowXY[1] + yOff, viewOnScreenXY[1]);