Add the suggestions UI in chrome

ios/chrome/browser/about_flags.mm

 // Copyright 2012 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.
 
 // Implementation of about_flags for iOS that sets flags based on experimental
 // settings.
 
 #include "ios/chrome/browser/about_flags.h"
 
 #include <stddef.h>
@@ skipping 240 matching lines @@
   // Populate command line flag for the Rename "Save Image" to "Download Image"
   // experiment.
   NSString* enableDownloadRenaming =
       [defaults stringForKey:@"EnableDownloadRenaming"];
   if ([enableDownloadRenaming isEqualToString:@"Enabled"]) {
     command_line->AppendSwitch(switches::kEnableDownloadImageRenaming);
   } else if ([enableDownloadRenaming isEqualToString:@"Disabled"]) {
     command_line->AppendSwitch(switches::kDisableDownloadImageRenaming);
   }
 
+  // Populate command line flag for Suggestions UI display.
+  NSString* enableSuggestions = [defaults stringForKey:@"EnableSuggestions"];
+  if ([enableSuggestions isEqualToString:@"Enabled"]) {
+    command_line->AppendSwitch(switches::kEnableSuggestionsUI);
+  } else if ([enableSuggestions isEqualToString:@"Disabled"]) {
+    command_line->AppendSwitch(switches::kDisableSuggestionsUI);
+  }
+
   // Freeform commandline flags.  These are added last, so that any flags added
   // earlier in this function take precedence.
   if ([defaults boolForKey:@"EnableFreeformCommandLineFlags"]) {
     base::CommandLine::StringVector flags;
     // Append an empty "program" argument.
     flags.push_back("");
 
     // The number of flags corresponds to the number of text fields in
     // Experimental.plist.
     const int kNumFreeformFlags = 5;
@@ skipping 72 matching lines @@
 }
 
 namespace testing {
 
 const flags_ui::FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing