Implement PrintBrowser functionality.

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_ui.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
index e1f286abcc707dc5649b500402f214e7e69a8b52..f26c8ba6630adf96ee8332dbc1b70078cd731a98 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
@@ -7,6 +7,7 @@
 #include <map>
 #include <vector>
 
+#include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/id_map.h"
 #include "base/lazy_instance.h"
@@ -29,6 +30,7 @@
 #include "chrome/browser/ui/webui/print_preview/print_preview_handler.h"
 #include "chrome/browser/ui/webui/theme_source.h"
 #include "chrome/common/chrome_features.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/browser_resources.h"
 #include "chrome/grit/chromium_strings.h"
@@ -418,6 +420,16 @@ content::WebUIDataSource* CreatePrintPreviewUISource() {
 #else
   source->AddBoolean("showLocalManageButton", true);
 #endif
+
+// printBrowserEnabled is used to determine whether or not to show the navbar
+#if BUILDFLAG(ENABLE_PRINT_BROWSER)
+  bool print_browser_enabled =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          ::switches::kEnablePrintBrowser);
+  source->AddBoolean("printBrowserEnabled", print_browser_enabled);
+#else
+  source->AddBoolean("printBrowserEnabled", false);
+#endif
   return source;
 }