Add 5 experimental accessibility features on Chrome OS.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index a2055020cbdbadf625cd4594368df4acbd9a704d..d2a90b3c9772a1a57ec1f3bf57c26d3e70db3b79 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1817,6 +1817,13 @@ const FeatureEntry kFeatureEntries[] = {
      IDS_FLAGS_OFFLINING_RECENT_PAGES_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(offline_pages::kOffliningRecentPagesFeature)},
 #endif  // defined(OS_ANDROID)
+#if defined(OS_CHROMEOS)
+    {"enable-experimental-accessibility-features",
+     IDS_FLAGS_EXPERIMENTAL_ACCESSIBILITY_FEATURES_NAME,
+     IDS_FLAGS_EXPERIMENTAL_ACCESSIBILITY_FEATURES_DESCRIPTION, kOsCrOS,
+     SINGLE_VALUE_TYPE(
+         chromeos::switches::kEnableExperimentalAccessibilityFeatures)},
+#endif
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.