Add IPCs to check web copy/cut/paste for extensions with the appropriate permission bit.

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

Index: chrome/test/data/extensions/api_test/clipboard/test.js
diff --git a/chrome/test/data/extensions/api_test/clipboard/test.js b/chrome/test/data/extensions/api_test/clipboard/test.js
index 9377129a740408b488c7facbf2ef4010b29a8f1f..b41a1b661a3cae555a5a5b15371fee7f987de199 100644
--- a/chrome/test/data/extensions/api_test/clipboard/test.js
+++ b/chrome/test/data/extensions/api_test/clipboard/test.js
@@ -65,6 +65,10 @@ chrome.test.getConfig(function(config) {
       );
       setupWindow();
     },
+    function domCopy() {
+      document.body.addEventListener('copy', chrome.test.callbackPass());
+      document.execCommand('copy');
+    },
     function domPaste() {
       document.body.addEventListener('paste', chrome.test.callbackPass());
       document.execCommand('paste');