Reland "Encapsulate CSS selector declarative content condition tracking"

chrome/browser/extensions/api/declarative_content/declarative_content_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 "chrome/browser/extensions/extension_action.h"
 #include "chrome/browser/extensions/extension_action_manager.h"
 #include "chrome/browser/extensions/extension_action_test_util.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/extensions/test_extension_dir.h"
@@ skipping 603 matching lines @@
                   "try {\n"
                   // "Complex" selector:
                   "  new PageStateMatcher({css: ['div input']});\n"
                   "  Return('Failed to throw');\n"
                   "} catch (e) {\n"
                   "  Return(e.message);\n"
                   "}\n"),
               testing::ContainsRegex("compound selector.*: div input$"));
 }
 
+// https://crbug.com/497586
+IN_PROC_BROWSER_TEST_F(DeclarativeContentApiTest,
+                       WebContentsWithoutTabAddedNotificationAtOnLoaded) {
+  // Add a web contents to the tab strip in a way that doesn't trigger
+  // NOTIFICATION_TAB_ADDED.
+  content::WebContents* contents = content::WebContents::Create(
+      content::WebContents::CreateParams(profile()));
+  browser()->tab_strip_model()->AppendWebContents(contents, false);
+
+  // The actual extension contents don't matter here -- we're just looking to
+  // trigger OnExtensionLoaded.
+  ext_dir_.WriteManifest(kDeclarativeContentManifest);
+  ext_dir_.WriteFile(FILE_PATH_LITERAL("background.js"), kBackgroundHelpers);
+  ASSERT_TRUE(LoadExtension(ext_dir_.unpacked_path()));
+}
+
 }  // namespace
 }  // namespace extensions