[Sync::USS] Adding the flag to enable USS Bookmarks on iOS

Bug: 911232
Change-Id: I4813401d73ae6281fd044882c8e61869223c0911
Reviewed-on: https://chromium-review.googlesource.com/c/1359034
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613260}

ios/chrome/browser/about_flags.mm

@@ -482,6 +482,10 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
      FEATURE_WITH_PARAMS_VALUE_TYPE(crash_report::kDetectMainThreadFreeze,
                                     kDetectMainThreadFreezeVariations,
                                     "DetectMainThreadFreeze")},
+    {"enable-sync-uss-bookmarks",
+     flag_descriptions::kEnableSyncUSSBookmarksName,
+     flag_descriptions::kEnableSyncUSSBookmarksDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(switches::kSyncUSSBookmarks)},
 };
 
 // Add all switches from experimental flags to |command_line|.

ios/chrome/browser/ios_chrome_flag_descriptions.cc

@@ -53,6 +53,10 @@ 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 kEnableSyncUSSBookmarksName[] = "Enable USS for bookmarks sync";
+const char kEnableSyncUSSBookmarksDescription[] =
+    "Enables the new, experimental implementation of bookmark sync";
+
 const char kSyncPseudoUSSFaviconsName[] = "Enable pseudo-USS for favicon sync.";
 const char kSyncPseudoUSSFaviconsDescription[] =
     "Enable new USS-based codepath for sync datatypes FAVICON_IMAGES and "

ios/chrome/browser/ios_chrome_flag_descriptions.h

@@ -46,6 +46,9 @@ extern const char
 extern const char kEnableAutofillSaveCreditCardUsesStrikeSystemName[];
 extern const char kEnableAutofillSaveCreditCardUsesStrikeSystemDescription[];
 
+extern const char kEnableSyncUSSBookmarksName[];
+extern const char kEnableSyncUSSBookmarksDescription[];
+
 extern const char kSyncPseudoUSSFaviconsName[];
 extern const char kSyncPseudoUSSFaviconsDescription[];