Add Accessibility Object Model to content features, and add a browser test.

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

Index: content/browser/accessibility/dump_accessibility_tree_browsertest.cc
diff --git a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
index b260892b072e40f21af9164e97a4ea76ada64e67..c4b47719c935d32e73dc7c799684f62538a9d86e 100644
--- a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
+++ b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
@@ -12,6 +12,7 @@
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_feature_list.h"
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "content/browser/accessibility/accessibility_tree_formatter.h"
@@ -21,6 +22,7 @@
 #include "content/browser/accessibility/dump_accessibility_browsertest_base.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_paths.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/content_browser_test_utils.h"
@@ -81,6 +83,20 @@ class DumpAccessibilityTreeTest : public DumpAccessibilityTestBase {
     RunTest(aria_file, "accessibility/aria");
   }
 
+  void RunAomTest(const base::FilePath::CharType* file_path) {
+    scoped_feature_list_.InitAndEnableFeature(
+        features::kAccessibilityObjectModel);
+
+    base::FilePath test_path = GetTestFilePath("accessibility", "aom");
+    {
+      base::ThreadRestrictions::ScopedAllowIO allow_io_for_test_setup;
+      ASSERT_TRUE(base::PathExists(test_path)) << test_path.LossyDisplayName();
+    }
+    base::FilePath aom_file = test_path.Append(base::FilePath(file_path));
+
+    RunTest(aom_file, "accessibility/aom");
+  }
+
   void RunCSSTest(const base::FilePath::CharType* file_path) {
     base::FilePath test_path = GetTestFilePath("accessibility", "css");
     {
@@ -118,6 +134,9 @@ class DumpAccessibilityTreeTest : public DumpAccessibilityTestBase {
         actual_contents, "\n",
         base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
   }
+
+ protected:
+  base::test::ScopedFeatureList scoped_feature_list_;
 };
 
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityCSSColor) {
@@ -172,6 +191,10 @@ IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityAOnclick) {
   RunHtmlTest(FILE_PATH_LITERAL("a-onclick.html"));
 }
 
+IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityAomChecked) {
+  RunAomTest(FILE_PATH_LITERAL("aom-checked.html"));
+}
+
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
                        AccessibilityAriaActivedescendant) {
   RunAriaTest(FILE_PATH_LITERAL("aria-activedescendant.html"));