Add an about flag to toggle the visibility of "All bookmarks"

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 e32de554029147036101f764530537dd2e1d8ae2..3da087aa3376b3d6250eddd96a8b9eef185b5383 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -370,6 +370,9 @@ const char kEnableAddToShelf[] = "enable-add-to-shelf";
 const char kEnableAppLink[] = "enable-app-link";
 #endif
 
+// Enables all bookmarks view in bookmark manager.
+const char kEnableAllBookmarksView[] = "enable-all-bookmarks-view";
+
 // Enable OS integration for Chrome app file associations.
 const char kEnableAppsFileAssociations[]    = "enable-apps-file-associations";