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

ios/chrome/browser/experimental_flags.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file can be empty. Its purpose is to contain the relatively short lived
 // definitions required for experimental flags.
 
 #include "ios/chrome/browser/experimental_flags.h"
 
 #include <dispatch/dispatch.h>
@@ skipping 84 matching lines @@
   // Check if the finch experiment is turned on.
   std::string group_name = base::FieldTrialList::FindFullName("IOSTabSwitcher");
   return base::StartsWith(group_name, "Enabled",
                           base::CompareCase::INSENSITIVE_ASCII);
 }
 
 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