Added flag in chrome://flags to enable the New Launcher UI.

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 7bc31c6e9011cd1ac0f9010f244131ce6e9d839f..f92b16e88c06f017d3b7ccfa8d32cf6cbc48ac75 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1439,6 +1439,11 @@ const FeatureEntry kFeatureEntries[] = {
         flag_descriptions::kDisplayColorCalibrationDescription, kOsCrOS,
         SINGLE_DISABLE_VALUE_TYPE(::switches::kDisableDisplayColorCalibration),
     },
+    {
+        "new-app-list-ui", flag_descriptions::kEnableNewAppListUIName,
+        flag_descriptions::kEnableNewAppListUIDescription, kOsCrOS,
+        SINGLE_VALUE_TYPE(app_list::switches::kEnableNewAppListUI),

[stevenjb, 2017/06/30 21:17:25]

Is there a better descriptor here than "new"?

[newcomer, 2017/06/30 21:40:23]

Fixed.

+    },
     {"instant-tethering", flag_descriptions::kTetherName,
      flag_descriptions::kTetherDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(features::kInstantTethering)},