Add tests to make sure copy/paste in an about:blank iframe in a hosted app works.

chrome/test/data/extensions/api_test/clipboard/extension_no_permission/test.js

Index: chrome/test/data/extensions/api_test/clipboard/extension_no_permission/test.js
diff --git a/chrome/test/data/extensions/api_test/clipboard/extension_no_permission/test.js b/chrome/test/data/extensions/api_test/clipboard/extension_no_permission/test.js
index b5650c25684c2caf0801b913dd20003eb8b3ae5e..544c6ed2853333a27d38f2b87b3bb383ded76013 100644
--- a/chrome/test/data/extensions/api_test/clipboard/extension_no_permission/test.js
+++ b/chrome/test/data/extensions/api_test/clipboard/extension_no_permission/test.js
@@ -17,5 +17,21 @@ chrome.test.runTests([
       chrome.test.succeed();
     else
       chrome.test.fail('execCommand("paste") succeeded');
+  },
+  function copyInIframe() {
+    var ifr = document.createElement('iframe');
+    document.body.appendChild(ifr);
+    if (ifr.contentDocument.execCommand('copy'))
+      chrome.test.succeed();
+    else
+      chrome.test.fail('execCommand("copy") failed in iframe');
+  },
+  function pasteInIframe() {
+    var ifr = document.createElement('iframe');
+    document.body.appendChild(ifr);
+    if (ifr.contentDocument.execCommand('paste'))
+      chrome.test.fail('execCommand("paste") succeeded in iframe');
+    else
+      chrome.test.succeed();
   }
 ]);