[Autofill] Add the dynamic form flag for iOS.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I3161ec166dce92c8f8014df17bd5315e05502058
Reviewed-on: https://chromium-review.googlesource.com/997155
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548453}

ios/chrome/browser/about_flags.mm

@@ -281,6 +281,9 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
     {"unified-consent", flag_descriptions::kUnifiedConsentName,
      flag_descriptions::kUnifiedConsentDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(signin::kUnifiedConsent)},
+    {"autofill-dynamic-forms", flag_descriptions::kAutofillDynamicFormsName,
+     flag_descriptions::kAutofillDynamicFormsDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(autofill::features::kAutofillDynamicForms)},
 };
 
 // Add all switches from experimental flags to |command_line|.

ios/chrome/browser/ios_chrome_flag_descriptions.cc

@@ -16,6 +16,10 @@ const char kAutofillIOSDelayBetweenFieldsDescription[] =
     "Delay between the different fields of a form being autofilled. In "
     "milliseconds.";
 
+const char kAutofillDynamicFormsName[] = "Autofill dynamic forms";
+const char kAutofillDynamicFormsDescription[] =
+    "Refills forms that dynamically change after an initial fill";
+
 const char kBrowserTaskScheduler[] = "Task Scheduler";
 const char kBrowserTaskSchedulerDescription[] =
     "Enables redirection of some task posting APIs to the task scheduler.";

ios/chrome/browser/ios_chrome_flag_descriptions.h

@@ -11,6 +11,10 @@ namespace flag_descriptions {
 extern const char kAutofillIOSDelayBetweenFieldsName[];
 extern const char kAutofillIOSDelayBetweenFieldsDescription[];
 
+// Title and description for the flag to controll the dynamic autofill.
+extern const char kAutofillDynamicFormsName[];
+extern const char kAutofillDynamicFormsDescription[];
+
 // Title and description for the flag to control redirection to the task
 // scheduler.
 extern const char kBrowserTaskScheduler[];