Add mixed forms flags to chrome://flags

Exposes existing feature flags for mixed forms interstitials and
disabling autofill on mixed forms in chrome://flags.

Bug: 1093102, 1093103
Change-Id: I5d8fef15579b9321148fb893e9881cdc3a68f22b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303990
Commit-Queue: Carlos IL <[email protected]>
Reviewed-by: Emily Stark <[email protected]>
Cr-Commit-Position: refs/heads/master@{#789310}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index b6938be0..dfdf31a 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -5946,9 +5946,19 @@
      flag_descriptions::kEditPasswordsInDesktopSettingsName,
      flag_descriptions::kEditPasswordsInDesktopSettingsDescription, kOsDesktop,
      FEATURE_VALUE_TYPE(
-         password_manager::features::kEditPasswordsInDesktopSettings)}
+         password_manager::features::kEditPasswordsInDesktopSettings)},
 #endif  // !defined(OS_ANDROID)
 
+    {"mixed-forms-disable-autofill",
+     flag_descriptions::kMixedFormsDisableAutofillName,
+     flag_descriptions::kMixedFormsDisableAutofillDescription, kOsAll,
+     FEATURE_VALUE_TYPE(autofill::features::kAutofillPreventMixedFormsFilling)},
+
+    {"mixed-forms-interstitial", flag_descriptions::kMixedFormsInterstitialName,
+     flag_descriptions::kMixedFormsInterstitialDescription, kOsAll,
+     FEATURE_VALUE_TYPE(
+         security_interstitials::kInsecureFormSubmissionInterstitial)}
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the