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

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

Bug: 1028755
Change-Id: I48bb2c6d20a707a2f44810e71403abd2eb8dda3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105797
Commit-Queue: Ali Juma <ajuma@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751691}

chrome/browser/flag-metadata.json

@@ -3417,6 +3417,11 @@
     "owners": [ "armax", "guidou" ],
     "expiry_milestone": 90
   },
+  {
+    "name": "safe-browsing-available",
+    "owners": [ "//ios/chrome/browser/safe_browsing/OWNERS" ],
+    "expiry_milestone": 85
+  },
   {
     "name": "safety-tips",
     "owners": [ "jdeblasio", "estark", "meacer" ],

ios/chrome/browser/flags/BUILD.gn

@@ -26,6 +26,7 @@ source_set("flags") {
     "//components/omnibox/common",
     "//components/password_manager/core/common",
     "//components/payments/core",
+    "//components/safe_browsing/core:features",
     "//components/search_provider_logos",
     "//components/security_state/core",
     "//components/send_tab_to_self",

ios/chrome/browser/flags/about_flags.mm

@@ -39,6 +39,7 @@
 #include "components/omnibox/common/omnibox_features.h"
 #include "components/password_manager/core/common/password_manager_features.h"
 #include "components/payments/core/features.h"
+#include "components/safe_browsing/core/features.h"
 #include "components/security_state/core/features.h"
 #include "components/send_tab_to_self/features.h"
 #include "components/signin/core/browser/account_reconcilor.h"
@@ -577,6 +578,9 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
      flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(
          web::features::kIOSLookalikeUrlNavigationSuggestionsUI)},
+    {"safe-browsing-available", flag_descriptions::kSafeBrowsingAvailableName,
+     flag_descriptions::kSafeBrowsingAvailableDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(safe_browsing::kSafeBrowsingAvailableOnIOS)},
 };
 
 // Add all switches from experimental flags to |command_line|.

ios/chrome/browser/flags/ios_chrome_flag_descriptions.cc

@@ -327,6 +327,11 @@ const char kReloadSadTabDescription[] =
     "When enabled, the first time the renderer crashes, the page is reloaded "
     "instead of showing the SadTab";
 
+const char kSafeBrowsingAvailableName[] = "Make Safe Browsing available";
+const char kSafeBrowsingAvailableDescription[] =
+    "When enabled, navigation URLs are compared to Safe Browsing blocklists, "
+    "subject to an opt-out preference.";
+
 const char kSaveCardInfobarMessagesUIName[] = "Save Card Infobar Messages UI";
 const char kSaveCardInfobarMessagesUIDescription[] =
     "When enabled, Save Card Infobar uses the new Messages UI.";

ios/chrome/browser/flags/ios_chrome_flag_descriptions.h

@@ -279,6 +279,10 @@ extern const char kPageInfoRefactoringDescription[];
 extern const char kReloadSadTabName[];
 extern const char kReloadSadTabDescription[];
 
+// Title and description for the flag that makes Safe Browsing available.
+extern const char kSafeBrowsingAvailableName[];
+extern const char kSafeBrowsingAvailableDescription[];
+
 // Title and description for the flag that enables Messages UI on
 // SaveCard Infobars.
 extern const char kSaveCardInfobarMessagesUIName[];