Enable accessibility testing for the bookmark browser test.

chrome/test/base/accessibility_test_helper.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.

[Paweł Hajdan Jr., 2015/01/29 13:01:18]

nit: 2015

[hcarmona, 2015/01/30 22:19:47]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/files/file_util.h"
+#include "base/path_service.h"
+#include "chrome/test/base/accessibility_test_helper.h"
+#include "content/public/test/browser_test_utils.h"
+
+// Library used for testing accessibility.
+const base::FilePath kAXSTesting(
+    FILE_PATH_LITERAL("third_party/accessibility-audit/axs_testing.js"));
+
+// static
+const std::string AccessibilityTestHelper::kExpectedResults = "";
+
+// static
+const std::string AccessibilityTestHelper::kAccessibilityTestString =
+    "var config = new axs.AuditConfiguration();"
+    "/* Disable warning about rules that cannot be checked. */"
+    "config.showUnsupportedRulesWarning = false;"
+    "config.auditRulesToIgnore = ["
+    "    /* "
+    "     * The 'elements with meaningful background image' accessibility"
+    "     * audit (AX_IMAGE_01) does not apply, since Chrome doesn't"
+    "     * disable background images in high-contrast mode like some"
+    "     * browsers do."
+    "     */"
+    "    'elementsWithMeaningfulBackgroundImage',"
+    "    /* "
+    "     * Most WebUI pages are inside an IFrame, so the 'web page should"
+    "     * have a title that describes topic or purpose' test (AX_TITLE_01)"
+    "     * generally does not apply."
+    "     */"
+    "    'pageWithoutTitle',"
+    "    /* "
+    "     * Enable when crbug.com/267035 is fixed."
+    "     * Until then it's just noise."
+    "     */"
+    "    'lowContrastElements'];"
+    "var result = axs.Audit.run(config);"
+    "var pass = true;"
+    "for (var i = 0; i < result.length; ++i) {"
+    "  if (result[i].result == axs.constants.AuditResult.FAIL) {"
+    "    pass = false;"
+    "    break;"
+    "  }"
+    "}"
+    "if (pass) {"
+    "  domAutomationController.send('');"
+    "}"
+    "else {"
+    "  domAutomationController.send(axs.Audit.createReport(result));"
+    "}";
+
+bool AccessibilityTestHelper::LoadLibrary(
+    content::WebContents* web_contents) {
+  return LoadScript(web_contents, kAXSTesting);
+}
+
+bool AccessibilityTestHelper::RunAccessibilityTest(
+    content::RenderFrameHost* focused_frame) {
+  // Clear accessibility message in case this method is called multiple times.
+  accessibility_message_ = "";
+
+  // Run the test.
+  return content::ExecuteScriptAndExtractString(
+      focused_frame,
+      kAccessibilityTestString,
+      &accessibility_message_);
+}
+
+std::string AccessibilityTestHelper::accessibility_message() {
+  return accessibility_message_;
+}
+
+bool AccessibilityTestHelper::LoadScript(content::WebContents* web_contents,
+    base::FilePath path) {
+  // All library paths should be relative to the source root.
+  base::FilePath src_dir;
+  if (!PathService::Get(base::DIR_SOURCE_ROOT, &src_dir))
+    return false;
+
+  // Get the full path of the library.
+  base::FilePath script_path = src_dir.Append(path);
+
+  std::string script;
+  if (!base::ReadFileToString(script_path, &script)) {
+    LOG(ERROR) << "Failed to load script " << script_path.value();
+    return false;
+  }
+
+  // Execute the script to load the library.
+  return content::ExecuteScript(web_contents, script);
+}
+