[Passwords] Create iOS UI Flag for HTTP FOAS

TBR=vasilii@chromium.org

Bug: 914765
Change-Id: Id318bd708fd718ebbec0bcd3fad245155eec5e5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539999Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644446}

ios/chrome/browser/about_flags.mm

@@ -422,6 +422,10 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
     {"fcm-invalidations", flag_descriptions::kFCMInvalidationsName,
      flag_descriptions::kFCMInvalidationsDescription, flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(invalidation::switches::kFCMInvalidations)},
+    {"fill-on-account-select-http",
+     flag_descriptions::kFillOnAccountSelectHttpName,
+     flag_descriptions::kFillOnAccountSelectHttpDescription, flags_ui::kOsIos,
+     FEATURE_VALUE_TYPE(password_manager::features::kFillOnAccountSelectHttp)},
     {"browser-container-contains-ntp",
      flag_descriptions::kBrowserContainerContainsNTPName,
      flag_descriptions::kBrowserContainerContainsNTPDescription,

ios/chrome/browser/ios_chrome_flag_descriptions.cc

@@ -273,6 +273,12 @@ const char kFCMInvalidationsName[] =
 const char kFCMInvalidationsDescription[] =
     "Use the new FCM-based protocol for deliveling invalidations";
 
+const char kFillOnAccountSelectHttpName[] =
+    "Fill passwords on account selection on HTTP origins";
+const char kFillOnAccountSelectHttpDescription[] =
+    "Filling of passwords when an account is explicitly selected by the user "
+    "rather than autofilling credentials on page load on HTTP origins.";
+
 const char kFullscreenViewportAdjustmentExperimentName[] =
     "Fullscreen Viewport Adjustment Mode";
 const char kFullscreenViewportAdjustmentExperimentDescription[] =

ios/chrome/browser/ios_chrome_flag_descriptions.h

@@ -216,6 +216,11 @@ extern const char kEnableClipboardProviderImageSuggestionsDescription[];
 extern const char kFCMInvalidationsName[];
 extern const char kFCMInvalidationsDescription[];
 
+// Title and description for the flag to enable fill passwords on account select
+// on HTTP origins.
+extern const char kFillOnAccountSelectHttpName[];
+extern const char kFillOnAccountSelectHttpDescription[];
+
 // Title and description for the command line switch used to determine the
 // active fullscreen viewport adjustment mode.
 extern const char kFullscreenViewportAdjustmentExperimentName[];