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

ios/chrome/browser/experimental_flags.mm

Index: ios/chrome/browser/experimental_flags.mm
diff --git a/ios/chrome/browser/experimental_flags.mm b/ios/chrome/browser/experimental_flags.mm
index 5d516a3ca1bca28e42e74a641abeb20a2b17236c..9218e898a40d629ddfbf52486cbba7aba606a721 100644
--- a/ios/chrome/browser/experimental_flags.mm
+++ b/ios/chrome/browser/experimental_flags.mm
@@ -102,4 +102,20 @@ bool IsReadingListEnabled() {
   return [[NSUserDefaults standardUserDefaults] boolForKey:kEnableReadingList];
 }
 
+bool IsAllBookmarksEnabled() {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kEnableAllBookmarksView)) {
+    return true;
+  } else if (command_line->HasSwitch(switches::kDisableAllBookmarksView)) {
+    return false;
+  }
+
+  // Check if the finch experiment is turned on. Flag is off by default.
+  std::string group_name =
+      base::FieldTrialList::FindFullName("RemoveAllBookmarks");
+
+  return base::StartsWith(group_name, "Enabled",
+                          base::CompareCase::INSENSITIVE_ASCII);
+}
+
 }  // namespace experimental_flags