Add a flag to control whether there is a shortcut for the app list / launcher in the Windows taskba…

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 14edccea109c189176994dbed43ddada5e262680..db9d795a6dab1b5894817282d5ff1efccae25a4d 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1070,6 +1070,13 @@ const Experiment kExperiments[] = {
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kWebIntentsInvocationEnabled)
   },
+  {
+    "show-app-list-shortcut",
+    IDS_FLAGS_SHOW_APP_LIST_SHORTCUT_NAME,
+    IDS_FLAGS_SHOW_APP_LIST_SHORTCUT_DESCRIPTION,
+    kOsWin,
+    SINGLE_VALUE_TYPE(switches::kShowAppListShortcut)
+  },
 };
 
 const Experiment* experiments = kExperiments;