[Extensions] Ensure ordering of extension [un]loaded, activated messages

chrome/browser/extensions/renderer_initialization_browsertest.cc

+// Copyright 2016 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 "chrome/browser/extensions/extension_browsertest.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/test/browser_test_utils.h"
+
+namespace extensions {
+
+// Test that opening a window with an extension recorded as active, then
+// unloading the extension, all before the renderer is fully initialized,
+// doesn't crash. This addresses crbug.com/528026, where messages could be sent
+// out of order if an extension unloaded before the activation message was sent.
+IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest,
+                       TestRendererStartupWithConflictingMessages) {
+  // Load up an extension an begin opening an URL to a page within it. Since
+  // this will be an extension tab, the extension will be active within that
+  // process.
+  const Extension* extension =
+      LoadExtension(test_data_dir_.AppendASCII("simple_with_file"));
+  ASSERT_TRUE(extension);
+  GURL url = extension->GetResourceURL("file.html");
+  browser()->OpenURL(content::OpenURLParams(url, content::Referrer(),
+                                            NEW_FOREGROUND_TAB,
+                                            ui::PAGE_TRANSITION_TYPED, false));
+  // Without waiting for the tab to finish, unload the extension.
+  extension_service()->UnloadExtension(extension->id(),
+                                       UnloadedExtensionInfo::REASON_TERMINATE);
+  content::WebContents* web_contents =
+      browser()->tab_strip_model()->GetActiveWebContents();
+  // Wait for the web contents to stop loading.
+  content::WaitForLoadStop(web_contents);
+  EXPECT_EQ(url, web_contents->GetLastCommittedURL());
+  ASSERT_FALSE(web_contents->IsCrashed());
+}
+
+}  // namespace extensions