[Password Manager] Switch password manager code to use the Feature framework.

components/password_manager/core/browser/password_manager_util.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/password_manager/core/browser/password_manager_util.h"
 
 #include <algorithm>
 
+#include "base/metrics/field_trial.h"
+#include "base/strings/string_util.h"
 #include "components/autofill/core/common/password_form.h"
 #include "components/password_manager/core/browser/log_manager.h"
+#include "components/password_manager/core/common/password_manager_features.h"
 #include "components/sync_driver/sync_service.h"
+#include "components/variations/variations_associated_data.h"
 
 namespace password_manager_util {
 
+namespace {
+
+void RegisterFieldTrialOverrideByGroup(
+    base::FeatureList* feature_list,
+    const base::Feature& feature,
+    const char* trial_name,
+    const char* group_name,
+    const base::FeatureList::OverrideState& override_state) {
+  base::FieldTrial* field_trial = base::FieldTrialList::Find(trial_name);
+  if (field_trial && base::StartsWith(field_trial->group_name(), group_name,
+                                      base::CompareCase::INSENSITIVE_ASCII)) {
+    feature_list->RegisterFieldTrialOverride(feature.name, override_state,
+                                             field_trial);
+  }
+}
+
+void RegisterFieldTrialOverrideByVariationParam(
+    base::FeatureList* feature_list,
+    const base::Feature& feature,
+    const char* trial_name,
+    const char* variation_param_value,
+    const base::FeatureList::OverrideState& override_state) {
+  base::FieldTrial* field_trial = base::FieldTrialList::Find(trial_name);
+  const std::string update_enabled =
+      variations::GetVariationParamValue(trial_name, variation_param_value);
+  if (field_trial && base::StartsWith(update_enabled, "disabled",

[vabr (Chromium), 2016/02/26 09:52:22]

nit: I believe calls to this function would be more readable if the "disabled"
was a parameter. Hardcoding it inside leaves no hint at the callsite, that it is
the value "disabled" which we look for.

[Pritam Nikam, 2016/02/26 12:42:23]

Acknowledged.

Added a in-line implementation instead.

+                                      base::CompareCase::INSENSITIVE_ASCII)) {
+    feature_list->RegisterFieldTrialOverride(feature.name, override_state,
+                                             field_trial);
+  }
+}
+
+}  // namespace
+
 password_manager::PasswordSyncState GetPasswordSyncState(
     const sync_driver::SyncService* sync_service) {
   if (sync_service && sync_service->IsFirstSetupComplete() &&
       sync_service->IsSyncActive() &&
       sync_service->GetActiveDataTypes().Has(syncer::PASSWORDS)) {
     return sync_service->IsUsingSecondaryPassphrase()
                ? password_manager::SYNCING_WITH_CUSTOM_PASSPHRASE
                : password_manager::SYNCING_NORMAL_ENCRYPTION;
   }
   return password_manager::NOT_SYNCING_PASSWORDS;
@@ skipping 59 matching lines @@
   }
   old_vector.weak_clear();  // All owned by |new_vector| by now.
   return new_vector;
 }
 
 bool IsLoggingActive(const password_manager::PasswordManagerClient* client) {
   const password_manager::LogManager* log_manager = client->GetLogManager();
   return log_manager && log_manager->IsLoggingActive();
 }
 
+void RegisterFieldTrials(base::FeatureList* feature_list) {

[Pritam Nikam, 2016/02/25 16:39:26]

I guess I've to move these changes in "fieldtrial_testing_config_schema.json'
instead ?

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/common/vari...

[Pritam Nikam, 2016/02/25 16:49:12]

"fieldtrial_testing_config_{port}.json"

eg.
https://code.google.com/p/chromium/codesearch#chromium/src/testing/variations...

[vabr (Chromium), 2016/02/26 09:52:22]

This does not sound like a good idea, actually. IIUC, the JSONs are there for
trybots, whereas this registering is needed for the official Chrome builds. I
would say you need this and not the JSONs, but please do confirm this with
Alexei or somebody knowledgeable.

+  // affiliation-based-matching:
+  // * default = on
+  // * Field trial name = "AffiliationBasedMatching"
+  //   - groups starting with "Disabled" turns the feature off.
+  //   - variation param value with "propagate_password_changes_to_web" turns

[vabr (Chromium), 2016/02/26 09:52:22]

Not every value, just the "disabled" value, right?

[Pritam Nikam, 2016/02/26 12:42:23]

Done.

+  //     the feature off.
+  //   - other groups turn the feature on.
+  RegisterFieldTrialOverrideByGroup(
+      feature_list, password_manager::features::kAffiliationBasedMatching,
+      "AffiliationBasedMatching", "Disabled",
+      base::FeatureList::OVERRIDE_DISABLE_FEATURE);
+
+  RegisterFieldTrialOverrideByVariationParam(

[vabr (Chromium), 2016/02/26 09:52:22]

nit: Maybe it would be more readable to inline this function? It only has one
call-site.

[Pritam Nikam, 2016/02/26 12:42:23]

Done.

+      feature_list, password_manager::features::kAffiliationBasedMatching,
+      "AffiliationBasedMatching", "propagate_password_changes_to_web",
+      base::FeatureList::OVERRIDE_DISABLE_FEATURE);
+
+  // drop-sync-credential
+  // * default = on
+  // * Field trial name = "PasswordManagerDropSyncCredential"
+  //   - group "Disabled" turns the feature off.
+  //   - other groups turn the feature on.
+  RegisterFieldTrialOverrideByGroup(
+      feature_list, password_manager::features::kDropSyncCredential,
+      "PasswordManagerDropSyncCredential", "Disabled",
+      base::FeatureList::OVERRIDE_DISABLE_FEATURE);
+
+  // protect-sync-credential
+  // * default = off
+  // * Field trial name = "AutofillSyncCredential"
+  //   - group "DisallowSyncCredentials" turns the feature on.
+  //   - other groups turn the feature off.
+  RegisterFieldTrialOverrideByGroup(
+      feature_list, password_manager::features::kProtectSyncCredential,
+      "AutofillSyncCredential", "DisallowSyncCredentials",
+      base::FeatureList::OVERRIDE_ENABLE_FEATURE);
+
+  // protect-sync-credential-on-reauth
+  // * default = off
+  // * Field trial name = "AutofillSyncCredential"
+  //   - groups "DisallowSyncCredentials" and "DisallowSyncCredentialsForReauth"
+  //     turn the feature on.
+  //   - other groups turn the feature off.
+  RegisterFieldTrialOverrideByGroup(
+      feature_list, password_manager::features::kProtectSyncCredentialOnReauth,
+      "AutofillSyncCredential", "DisallowSyncCredentials",
+      base::FeatureList::OVERRIDE_ENABLE_FEATURE);
+
+  RegisterFieldTrialOverrideByGroup(
+      feature_list, password_manager::features::kProtectSyncCredentialOnReauth,
+      "AutofillSyncCredential", "DisallowSyncCredentialsForReauth",
+      base::FeatureList::OVERRIDE_ENABLE_FEATURE);
+}
+
 }  // namespace password_manager_util