Change these tests to actually trigger the execCommand from the iframe context.

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 544c6ed2853333a27d38f2b87b3bb383ded76013..a068b2d08e9c173414424dab0a97e811b99270dd 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
@@ -21,17 +21,21 @@ chrome.test.runTests([
   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');
+    window.command = 'copy';
+    ifr.contentDocument.write('<script src="iframe.js"></script>');
   },
   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();
+    window.command = 'paste';
+    ifr.contentDocument.write('<script src="iframe.js"></script>');
   }
 ]);
+
+function testDone(result) {
+  if (window.command === 'paste') result = !result;

[not at google - send to devlin, 2014/08/22 17:21:35]

I find it hard to parse this out of context (bouncing off the that
document.write/iframe doesn't help). Perhaps add a comment or rephrase? It's a
little odd to be reversing the result like this. Perhaps phrase it in terms of
expected result?

// 'copy' should always succeed regardless of the kClipboardWrite permission,
// for backwards compatibility. 'paste' should always fail because the extension
// doesn't have kClipboardRead.
var expected = window.command === 'copy';
if (result != expected)
  ...

+  if (result)
+    chrome.test.succeed();
+  else
+    chrome.test.fail();
+}