Add feature for tracking leaked credentials

It doesn't need a flag now and is not used anywhere yet.

Bug: 1005746
Change-Id: I22190ebf4d808984efc37fcfe69e4f23663c4088
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1821521Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Rafał Godlewski <rgod@google.com>
Cr-Commit-Position: refs/heads/master@{#699775}

components/password_manager/core/common/password_manager_features.cc

@@ -48,6 +48,10 @@ const base::Feature kGooglePasswordManager = {
 const base::Feature kLeakDetection = {"PasswordLeakDetection",
                                       base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables storing leaked credentials in the database.
+const base::Feature kLeakHistory = {"PasswordLeakHistory",
+                                    base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Controls whether to offer manual password generation in the accessory sheet
 // on Android.
 const base::Feature kManualPasswordGenerationAndroid{

components/password_manager/core/common/password_manager_features.h

@@ -25,6 +25,7 @@ extern const base::Feature kFillOnAccountSelectHttp;
 extern const base::Feature kGenerationNoOverwrites;
 extern const base::Feature kGooglePasswordManager;
 extern const base::Feature kLeakDetection;
+extern const base::Feature kLeakHistory;
 extern const base::Feature kManualPasswordGenerationAndroid;
 extern const base::Feature kPasswordEditingAndroid;
 extern const base::Feature kPasswordImport;