Add a browser test for access control for file: scheme

chrome/browser/net/errorpage_test_util.cc

Index: chrome/browser/net/errorpage_test_util.cc
diff --git a/chrome/browser/net/errorpage_test_util.cc b/chrome/browser/net/errorpage_test_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f745821f4387545e89e34881e548a387d513efe8
--- /dev/null
+++ b/chrome/browser/net/errorpage_test_util.cc
@@ -0,0 +1,38 @@
+// Copyright (c) 2017 The Chromium Authors. All rights reserved.

[mmenke, 2017/06/05 18:31:34]

--(c)

[satorux1, 2017/06/06 08:52:37]

done - but this file is gone.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/net/errorpage_test_util.h"
+
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
+#include "net/base/net_errors.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace errorpage_test_util {
+
+bool IsDisplayingText(Browser* browser, const std::string& text) {
+  // clang-format off
+  std::string command = base::StringPrintf(R"(
+    function isNodeVisible(node) {
+      if (!node || node.classList.contains('hidden'))
+        return false;
+      if (!node.parentElement)
+        return true;
+      // Otherwise, we must check all parent nodes
+      return isNodeVisible(node.parentElement);
+    }
+    var node = document.evaluate("//*[contains(text(),'%s')]", document,
+      null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
+    domAutomationController.send(isNodeVisible(node));
+  )", text.c_str());
+  // clang-format on
+  bool result = false;
+  EXPECT_TRUE(content::ExecuteScriptAndExtractBool(
+      browser->tab_strip_model()->GetActiveWebContents(), command, &result));
+  return result;
+}
+
+}  // namespace errorpage_test_util