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

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 3880c9777d803cd8ece35311f600d206e23e1586..a84f60032b3c2dc3bbda2f2e30ac948a6b03b80e 100644
--- a/ios/chrome/browser/experimental_flags.mm
+++ b/ios/chrome/browser/experimental_flags.mm
@@ -44,6 +44,8 @@ NSString* const kSafariVCSignInDisabled = @"SafariVCSignInDisabled";
 NSString* const kWhatsNewPromoStatus = @"WhatsNewPromoStatus";
 const base::Feature kEnableSlimNavigationManager{
     "EnableSlimNavigationManager", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kEnableThirdPartyKeyboardWorkaround{
+    "EnableThirdPartyKeyboardWorkaround", base::FEATURE_ENABLED_BY_DEFAULT};
 
 }  // namespace
 
@@ -304,4 +306,18 @@ bool IsSlimNavigationManagerEnabled() {
   return base::FeatureList::IsEnabled(kEnableSlimNavigationManager);
 }
 
+bool IsThirdPartyKeyboardWorkaroundEnabled() {
+  // Check if the experimental flag is forced on or off.
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kEnableThirdPartyKeyboardWorkaround)) {
+    return true;
+  } else if (command_line->HasSwitch(
+                 switches::kDisableThirdPartyKeyboardWorkaround)) {
+    return false;
+  }
+
+  // Check if the Finch experiment is turned on.
+  return base::FeatureList::IsEnabled(kEnableThirdPartyKeyboardWorkaround);
+}
+
 }  // namespace experimental_flags