Add an accessibility audit test for WebUI pages

chrome/test/data/webui/test_api.js

Index: chrome/test/data/webui/test_api.js
diff --git a/chrome/test/data/webui/test_api.js b/chrome/test/data/webui/test_api.js
index 03c6721d51d55bf0baf4641caa2e6d9955c31802..299cfaa679d1b26056e2fe62a2a6b92746295b2e 100644
--- a/chrome/test/data/webui/test_api.js
+++ b/chrome/test/data/webui/test_api.js
@@ -221,6 +221,25 @@ var testing = {};
           currentTestCase, [whenTestDone].concat(
               Array.prototype.slice.call(arguments, 1)));
     },
+
+    /**
+     * Run an accessibility audit on the current page state.
+     * @type {Function}
+     */
+    runAccessibilityAudit: function() {
+      for (var auditRuleName in axs.AuditRule.specs) {
+        var auditRule = axs.AuditRules.getRule(auditRuleName);
+        if (!auditRule)
+          continue; // Shouldn't happen, but fail silently if it does.
+        if (!auditRule.disabled && !auditRule.requiresConsoleAPI) {
+          var result = auditRule.run();
+          expectTrue(result.result == axs.constants.AuditResult.PASS ||
+                     result.result == axs.constants.AuditResult.NA,
+                     "Accessibility audit rule " + auditRule.name + " failed");
+        }
+      }
+      testDone();
+    }
   };
 
   /**
@@ -619,7 +638,8 @@ var testing = {};
         currentTestCase = null;
       }
       chrome.send('testResult', result ? result : testResult());
-      errors.splice(0, errors.length);
+//      errors.splice(0, errors.length);
+      resetTestState();
     } else {
       console.warn('testIsDone already');
     }
@@ -984,8 +1004,11 @@ var testing = {};
     var fixtureConstructor = this[testFixture];
     if (!fixtureConstructor.prototype.name)
       fixtureConstructor.prototype.name = testFixture;
-    if (fixtureConstructor['testCaseBodies'] === undefined)
+    if (fixtureConstructor['testCaseBodies'] === undefined) {
       fixtureConstructor.testCaseBodies = {};
+      fixtureConstructor.testCaseBodies["accessibilityAudit"] =
+        Test.prototype.runAccessibilityAudit;
+    }
     fixtureConstructor.testCaseBodies[testName] = testBody;
   }