[iOS] Add an about:flags entry for real-time Safe Browsing

This adds an about:flags entry for real-time Safe Browsing
lookups, to make it easier to enable and test.

Bug: 1103213
Change-Id: I28bae0f333ece6d1f5f8f4dcf5b3c89ef6037772
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315236
Commit-Queue: Ali Juma <ajuma@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791295}

chrome/browser/flag-metadata.json

@@ -3736,6 +3736,11 @@
     ],
     "expiry_milestone": 88
   },
+  {
+    "name": "safe-browsing-real-time",
+    "owners": [ "//ios/chrome/browser/safe_browsing/OWNERS" ],
+    "expiry_milestone": 88
+  },
   {
     "name": "safe-browsing-security-section-ui-android",
     "owners": [

ios/chrome/browser/flags/about_flags.mm

@@ -578,6 +578,11 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
     {"safe-browsing-available", flag_descriptions::kSafeBrowsingAvailableName,
      flag_descriptions::kSafeBrowsingAvailableDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(safe_browsing::kSafeBrowsingAvailableOnIOS)},
+    {"safe-browsing-real-time",
+     flag_descriptions::kSafeBrowsingRealTimeLookupName,
+     flag_descriptions::kSafeBrowsingRealTimeLookupDescription,
+     flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(safe_browsing::kRealTimeUrlLookupEnabled)},
     {"qr-code-generation", flag_descriptions::kQRCodeGenerationName,
      flag_descriptions::kQRCodeGenerationDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(kQRCodeGeneration)},

ios/chrome/browser/flags/ios_chrome_flag_descriptions.cc

@@ -407,6 +407,11 @@ const char kSafeBrowsingAvailableDescription[] =
     "When enabled, navigation URLs are compared to Safe Browsing blocklists, "
     "subject to an opt-out preference.";
 
+const char kSafeBrowsingRealTimeLookupName[] = "Enable real-time Safe Browsing";
+const char kSafeBrowsingRealTimeLookupDescription[] =
+    "When enabled, navigation URLs are checked using real-time queries to Safe "
+    "Browsing servers, subject to an opt-in preference.";
+
 const char kSafetyCheckIOSName[] = "Enable safety check on iOS";
 const char kSafetyCheckIOSDescription[] =
     "When enabled, the iOS version of safety check is available in Chrome "

ios/chrome/browser/flags/ios_chrome_flag_descriptions.h

@@ -353,6 +353,10 @@ extern const char kReloadSadTabDescription[];
 extern const char kSafeBrowsingAvailableName[];
 extern const char kSafeBrowsingAvailableDescription[];
 
+// Title and description for the flag to enable real-time Safe Browsing lookups.
+extern const char kSafeBrowsingRealTimeLookupName[];
+extern const char kSafeBrowsingRealTimeLookupDescription[];
+
 // Title and description for the flag to enable safety check on iOS.
 extern const char kSafetyCheckIOSName[];
 extern const char kSafetyCheckIOSDescription[];