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

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 31ccc53fc9d3429cabba04113900b47e278fd934..c659c09dbe97a3a300fac014aeedfec51eaf9e96 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1165,6 +1165,9 @@ const char kSetToken[]                      = "set-token";
 // If true the app list will be shown.
 const char kShowAppList[]                   = "show-app-list";
 
+// If true an app list shortcut will be shown in the taskbar.
+const char kShowAppListShortcut[]           = "show-app-list-shortcut";
+
 // Annotates forms with Autofill field type predictions.
 const char kShowAutofillTypePredictions[]   = "show-autofill-type-predictions";