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

chrome/browser/extensions/extension_dom_clipboard_apitest.cc

Index: chrome/browser/extensions/extension_dom_clipboard_apitest.cc
diff --git a/chrome/browser/extensions/extension_dom_clipboard_apitest.cc b/chrome/browser/extensions/extension_dom_clipboard_apitest.cc
index 21c32dc8551d15bd72f90460de3eea3cc3106a5e..b15822e3c92c04150e0d29e07318100f2f39c1a0 100644
--- a/chrome/browser/extensions/extension_dom_clipboard_apitest.cc
+++ b/chrome/browser/extensions/extension_dom_clipboard_apitest.cc
@@ -21,6 +21,8 @@ class ClipboardApiTest : public ExtensionApiTest {
                      const std::string& launch_page);
   bool ExecuteCopyInSelectedTab(bool* result);
   bool ExecutePasteInSelectedTab(bool* result);
+  bool ExecuteCopyInIframeInSelectedTab(bool* result);
+  bool ExecutePasteInIframeInSelectedTab(bool* result);
 
  private:
   bool ExecuteScriptInSelectedTab(const std::string& script, bool* result);
@@ -67,6 +69,24 @@ bool ClipboardApiTest::ExecutePasteInSelectedTab(bool* result) {
   return ExecuteScriptInSelectedTab(kScript, result);
 }
 
+bool ClipboardApiTest::ExecuteCopyInIframeInSelectedTab(bool* result) {
+  const char kScript[] =
+      "var ifr = document.createElement('iframe');\n"
+      "document.body.appendChild(ifr);\n"
+      "window.domAutomationController.send("
+          "ifr.contentDocument.execCommand('copy'));";
+  return ExecuteScriptInSelectedTab(kScript, result);
+}
+
+bool ClipboardApiTest::ExecutePasteInIframeInSelectedTab(bool* result) {
+  const char kScript[] =
+      "var ifr = document.createElement('iframe');\n"
+      "document.body.appendChild(ifr);\n"
+      "window.domAutomationController.send("
+          "ifr.contentDocument.execCommand('paste'));";
+  return ExecuteScriptInSelectedTab(kScript, result);
+}
+
 bool ClipboardApiTest::ExecuteScriptInSelectedTab(const std::string& script,
                                                   bool* result) {
   if (!content::ExecuteScriptAndExtractBool(
@@ -100,6 +120,10 @@ IN_PROC_BROWSER_TEST_F(ClipboardApiTest, HostedApp) {
   EXPECT_TRUE(result);
   ASSERT_TRUE(ExecutePasteInSelectedTab(&result)) << message_;
   EXPECT_TRUE(result);
+  ASSERT_TRUE(ExecuteCopyInIframeInSelectedTab(&result)) << message_;
+  EXPECT_TRUE(result);
+  ASSERT_TRUE(ExecutePasteInIframeInSelectedTab(&result)) << message_;
+  EXPECT_TRUE(result);
 }
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, HostedAppNoPermission) {
@@ -111,5 +135,9 @@ IN_PROC_BROWSER_TEST_F(ClipboardApiTest, HostedAppNoPermission) {
   EXPECT_FALSE(result);
   ASSERT_TRUE(ExecutePasteInSelectedTab(&result)) << message_;
   EXPECT_FALSE(result);
+  ASSERT_TRUE(ExecuteCopyInIframeInSelectedTab(&result)) << message_;
+  EXPECT_FALSE(result);
+  ASSERT_TRUE(ExecutePasteInIframeInSelectedTab(&result)) << message_;
+  EXPECT_FALSE(result);
 }