Add a test for Flash Fullscreen from a cross-site subframe.

ppapi/tests/test_case.html

Index: ppapi/tests/test_case.html
diff --git a/ppapi/tests/test_case.html b/ppapi/tests/test_case.html
index 529c97448c1aaea0db5241cd429f459e6ada0c20..e28091e7db4ca31c38a451a44c83488ba696d4b9 100644
--- a/ppapi/tests/test_case.html
+++ b/ppapi/tests/test_case.html
@@ -60,8 +60,9 @@ function DidExecuteTests(result) {
     return;
 
   // Otherwise, we are in a subframe, so we can use this opportunity to resize
-  // ourselves.
-  AdjustHeight(window);
+  // ourselves.  This can only be done if the parent frame has the same origin.
+  if (window.frameElement)
+    AdjustHeight(window);
 }
 
 function AppendFrame(testcase, i) {