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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/browser_test_utils.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "url/gurl.h"
 
 namespace {
 
 class ClipboardApiTest : public ExtensionApiTest {
  public:
   bool LoadHostedApp(const std::string& app_name,
                      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);
 };
 
 bool ClipboardApiTest::LoadHostedApp(const std::string& app_name,
                                      const std::string& launch_page) {
   host_resolver()->AddRule("*", "127.0.0.1");
 
   if (!StartEmbeddedTestServer()) {
@@ skipping 26 matching lines @@
       "window.domAutomationController.send(document.execCommand('copy'))";
   return ExecuteScriptInSelectedTab(kScript, result);
 }
 
 bool ClipboardApiTest::ExecutePasteInSelectedTab(bool* result) {
   const char kScript[] =
       "window.domAutomationController.send(document.execCommand('paste'))";
   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(
           browser()->tab_strip_model()->GetActiveWebContents(),
           script,
           result)) {
     message_ = "Failed to execute script in selected tab.";
     return false;
   }
   return true;

[not at google - send to devlin, 2014/08/21 20:28:11]

We could save a whole bunch of lines of code here because
ExecuteScriptAndExtractBool basically doesn't fail unless there's something very
wrong. So you should be able to change this method to
(1) ASSERT_TRUE(content::ExecuteScriptAndExtractBool(..))
(2) Return the |result| bool rather than making it an out-param.

Many fewer LOC.

[Marijn Kruisselbrink, 2014/08/21 20:50:20]

Done (except with CHECK instead of ASSERT_TRUE as discussed offline).

 }
 
 }  // namespace
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, Extension) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("clipboard/extension")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, ExtensionNoPermission) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("clipboard/extension_no_permission"))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ClipboardApiTest, HostedApp) {
   ASSERT_TRUE(LoadHostedApp("hosted_app", "main.html")) << message_;
 
   bool result = false;
   ASSERT_TRUE(ExecuteCopyInSelectedTab(&result)) << message_;
   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) {
   ASSERT_TRUE(LoadHostedApp("hosted_app_no_permission", "main.html"))
       << message_;
 
   bool result = false;
   ASSERT_TRUE(ExecuteCopyInSelectedTab(&result)) << message_;
   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);
 }