[Autofill] Add Autofill StrikeDatabase switch to about_flags for iOS

Bug: 884817
Change-Id: Ie2535ee36d806801ecc98891c6ec37c53a339365
Reviewed-on: https://chromium-review.googlesource.com/c/1302329Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#603185}

ios/chrome/browser/about_flags.mm

@@ -236,6 +236,13 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
      flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(
          autofill::features::kAutofillUpstreamUseGooglePayBrandingOnMobile)},
+    {"enable-autofill-save-credit-card-uses-strike-system",
+     flag_descriptions::kEnableAutofillSaveCreditCardUsesStrikeSystemName,
+     flag_descriptions::
+         kEnableAutofillSaveCreditCardUsesStrikeSystemDescription,
+     flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(
+         autofill::features::kAutofillSaveCreditCardUsesStrikeSystem)},
     {"use-sync-sandbox", flag_descriptions::kSyncSandboxName,
      flag_descriptions::kSyncSandboxDescription, flags_ui::kOsIos,
      SINGLE_VALUE_TYPE_AND_VALUE(

ios/chrome/browser/ios_chrome_flag_descriptions.cc

@@ -40,6 +40,12 @@ const char kEnableAutofillCreditCardUploadUpdatePromptExplanationDescription[] =
     "If enabled, changes the server save card prompt's explanation to mention "
     "the saving of the billing address.";
 
+const char kEnableAutofillSaveCreditCardUsesStrikeSystemName[] =
+    "Enable limit on offering to save the same credit card repeatedly";
+const char kEnableAutofillSaveCreditCardUsesStrikeSystemDescription[] =
+    "If enabled, prevents popping up the credit card offer-to-save prompt if "
+    "it has repeatedly been ignored, declined, or failed.";
+
 const char kSyncSandboxName[] = "Use Chrome Sync sandbox";
 const char kSyncSandboxDescription[] =
     "Connects to the testing server for Chrome Sync.";

ios/chrome/browser/ios_chrome_flag_descriptions.h

@@ -30,6 +30,12 @@ extern const char kEnableAutofillCreditCardUploadUpdatePromptExplanationName[];
 extern const char
     kEnableAutofillCreditCardUploadUpdatePromptExplanationDescription[];
 
+// Title and description for the flag to control if credit card save should
+// utilize the Autofill StrikeDatabase when determining whether save should be
+// offered.
+extern const char kEnableAutofillSaveCreditCardUsesStrikeSystemName[];
+extern const char kEnableAutofillSaveCreditCardUsesStrikeSystemDescription[];
+
 // Title and description for the flag to control if Chrome Sync should use the
 // sandbox servers.
 extern const char kSyncSandboxName[];