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

ui/app_list/app_list_switches.cc

Index: ui/app_list/app_list_switches.cc
diff --git a/ui/app_list/app_list_switches.cc b/ui/app_list/app_list_switches.cc
index 89f621e2238eedc118e6a1186443c68223e8fa98..8f11f5426e05a30504965b24dd1b7dca0a2bfe86 100644
--- a/ui/app_list/app_list_switches.cc
+++ b/ui/app_list/app_list_switches.cc
@@ -21,6 +21,9 @@ const char kDisableAppListDismissOnBlur[] = "disable-app-list-dismiss-on-blur";
 // If set, the app list will be enabled as if enabled from CWS.
 const char kEnableAppList[] = "enable-app-list";
 
+// If set, fullscreen app list will be enabled as if the feature flag was set.
+const char kEnableNewAppListUI[] = "enable-new-launcher-ui";

[stevenjb, 2017/06/30 21:17:26]

Is this just intended to enable the fullscreen app list feature with a flag? If
so it should be named enable-fullscreen-app-list and the variable names should
ve changed accordingly. If not, please document exactly what this switch is for.

[newcomer, 2017/06/30 21:40:24]

Done.

+
 // Enable/disable syncing of the app list independent of extensions.
 const char kEnableSyncAppList[] = "enable-sync-app-list";
 const char kDisableSyncAppList[] = "disable-sync-app-list";
@@ -41,6 +44,10 @@ bool IsAppListSyncEnabled() {
       kDisableSyncAppList);
 }
 
+bool IsNewAppListUIEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(kEnableNewAppListUI);
+}
+
 bool IsFolderUIEnabled() {
   // Folder UI is available only when AppList sync is enabled, and should
   // not be disabled separately.