[ios] Workaround error affecting 3rd party keyboards and omnibox.

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 268 matching lines @@
     command_line->AppendSwitch(switches::kEnableBookmarkReordering);
   } else if ([enableBookmarkReordering isEqualToString:@"Disabled"]) {
     command_line->AppendSwitch(switches::kDisableBookmarkReordering);
   }
 
   // Populate command line flag for the request mobile site experiment from the
   // configuration plist.
   if ([defaults boolForKey:@"RequestMobileSiteDisabled"])
     command_line->AppendSwitch(switches::kDisableRequestMobileSite);
 
+  // Populate command line flag for 3rd party keyboard omnibox workaround.
+  NSString* enableThirdPartyKeyboardWorkaround =
+      [defaults stringForKey:@"EnableThirdPartyKeyboardWorkaround"];
+  if ([enableThirdPartyKeyboardWorkaround isEqualToString:@"Enabled"]) {
+    command_line->AppendSwitch(switches::kEnableThirdPartyKeyboardWorkaround);
+  } else if ([enableThirdPartyKeyboardWorkaround isEqualToString:@"Disabled"]) {
+    command_line->AppendSwitch(switches::kDisableThirdPartyKeyboardWorkaround);
+  }
+
   ios::GetChromeBrowserProvider()->AppendSwitchesFromExperimentalSettings(
       defaults, command_line);
 }
 
 bool SkipConditionalFeatureEntry(const flags_ui::FeatureEntry& entry) {
   return false;
 }
 
 class FlagsStateSingleton {
  public:
@@ skipping 52 matching lines @@
 }
 
 namespace testing {
 
 const flags_ui::FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing