Allow a main interstitial frame to act as an ExtensionMessagePort opener

chrome/browser/extensions/extension_messages_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 <stddef.h>
 #include <stdint.h>
 #include <utility>
 
 #include "base/base64.h"
 #include "base/files/file_path.h"
@@ skipping 149 matching lines @@
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MessagingEventURL) {
   MessageSender sender;
   ASSERT_TRUE(RunExtensionTest("messaging/event_url")) << message_;
 }
 
 // Tests that messages cannot be received from the same frame.
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MessagingBackgroundOnly) {
   ASSERT_TRUE(RunExtensionTest("messaging/background_only")) << message_;
 }
 
+// Tests whether an extension in an interstitial page can send messages to the
+// background.

[Charlie Reis, 2016/01/26 23:58:27]

nit: background page.

+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MessagingInterstitial) {
+  net::EmbeddedTestServer https_server(net::EmbeddedTestServer::TYPE_HTTPS);
+  https_server.SetSSLConfig(net::EmbeddedTestServer::CERT_MISMATCHED_NAME);
+  ASSERT_TRUE(https_server.Start());
+
+  ASSERT_TRUE(RunExtensionSubtest("messaging/interstitial_component",
+                                  https_server.base_url().spec(),
+                                  kFlagLoadAsComponent)) << message_;
+}
+
 // Tests connecting from a panel to its extension.
 class PanelMessagingTest : public ExtensionApiTest {
   void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnablePanels);
   }
 };
 
 IN_PROC_BROWSER_TEST_F(PanelMessagingTest, MessagingPanel) {
   ASSERT_TRUE(RunExtensionTest("messaging/connect_panel")) << message_;
@@ skipping 1049 matching lines @@
   ui_test_utils::NavigateToURL(browser(), chromium_org_url());
   EXPECT_EQ(COULD_NOT_ESTABLISH_CONNECTION_ERROR,
             CanConnectAndSendMessagesToMainFrame(invalid.get()));
 }
 
 #endif  // !defined(OS_WIN) - http://crbug.com/350517.
 
 }  // namespace
 
 };  // namespace extensions