Adding flags and finch trial for the removal of All Bookmarks view.

ios/chrome/browser/chrome_switches.cc

Index: ios/chrome/browser/chrome_switches.cc
diff --git a/ios/chrome/browser/chrome_switches.cc b/ios/chrome/browser/chrome_switches.cc
index 1f78eacf1866af1b43df3fcfca4851e4a6daa488..564850061a0072a237b17b187223b7e93ef240f6 100644
--- a/ios/chrome/browser/chrome_switches.cc
+++ b/ios/chrome/browser/chrome_switches.cc
@@ -12,6 +12,9 @@ namespace switches {
 // all work out.
 // -----------------------------------------------------------------------------
 
+// Disables all bookmarks view in bookmark manager.
+const char kDisableAllBookmarksView[] = "disable-all-bookmarks-view";
+
 // Disables Contextual Search.
 const char kDisableContextualSearch[] = "disable-contextual-search";
 
@@ -49,6 +52,9 @@ const char kDisableTabEviction[] = "disable-tab-eviction";
 // Disables the tab switcher.
 const char kDisableTabSwitcher[] = "disable-tab-switcher";
 
+// Enables all bookmarks view in bookmark manager.
+const char kEnableAllBookmarksView[] = "enable-all-bookmarks-view";
+
 // Enables Contextual Search.
 const char kEnableContextualSearch[] = "enable-contextual-search";