Add histograms to track synced pref changes.

chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc

Index: chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc
diff --git a/chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc b/chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1dde6a8fb78cb77e4d350e07c2b762b40f180a10
--- /dev/null
+++ b/chrome/browser/prefs/synced_pref_change_registrar_browsertest.cc
@@ -0,0 +1,216 @@
+// Copyright 2013 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 <string>
+
+#include "base/json/json_string_value_serializer.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/time/time.h"
+#include "base/values.h"
+#include "chrome/browser/policy/browser_policy_connector.h"
+#include "chrome/browser/policy/mock_configuration_policy_provider.h"
+#include "chrome/browser/policy/policy_map.h"
+#include "chrome/browser/prefs/synced_pref_change_registrar.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/testing_pref_service_syncable.h"
+#include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_utils.h"
+#include "policy/policy_constants.h"
+#include "sync/api/sync_change.h"
+#include "sync/api/sync_error_factory.h"
+#include "sync/api/sync_error_factory_mock.h"
+#include "sync/api/syncable_service.h"
+#include "sync/protocol/sync.pb.h"
+
+namespace {
+
+using testing::AnyNumber;
+using testing::Return;
+using testing::_;
+
+class TestSyncProcessorStub : public syncer::SyncChangeProcessor {
+  virtual syncer::SyncError ProcessSyncChanges(
+      const tracked_objects::Location& from_here,
+      const syncer::SyncChangeList& change_list) OVERRIDE {
+    return syncer::SyncError();
+  }
+};
+
+class SyncedPrefChangeRegistrarTest : public InProcessBrowserTest {
+ public:
+  SyncedPrefChangeRegistrarTest() : next_sync_data_id_(0) {}
+  virtual ~SyncedPrefChangeRegistrarTest() {}
+
+  void UpdateChromePolicy(const policy::PolicyMap& policies) {
+    policy_provider_.UpdateChromePolicy(policies);
+    DCHECK(base::MessageLoop::current());
+    base::RunLoop loop;
+    loop.RunUntilIdle();
+  }
+
+  void SetBooleanPrefValueFromSync(const std::string& name, bool value) {
+    std::string serialized_value;
+    JSONStringValueSerializer json(&serialized_value);
+    json.Serialize(base::FundamentalValue(value));
+
+    sync_pb::EntitySpecifics specifics;
+    sync_pb::PreferenceSpecifics* pref_specifics =
+        specifics.mutable_preference();
+    pref_specifics->set_name(name);
+    pref_specifics->set_value(serialized_value);
+
+    syncer::SyncData change_data = syncer::SyncData::CreateRemoteData(
+        ++next_sync_data_id_, specifics, base::Time());
+    syncer::SyncChange change(
+        FROM_HERE, syncer::SyncChange::ACTION_UPDATE, change_data);
+
+    syncer::SyncChangeList change_list;
+    change_list.push_back(change);
+
+    syncer_->ProcessSyncChanges(FROM_HERE, change_list);
+  }
+
+  void SetBooleanPrefValueFromLocal(const std::string& name, bool value) {
+    prefs_->SetBoolean(name.c_str(), value);
+  }
+
+  bool GetBooleanPrefValue(const std::string& name) {
+    return prefs_->GetBoolean(name.c_str());
+  }
+
+  PrefServiceSyncable* prefs() const {
+    return prefs_;
+  }
+
+  SyncedPrefChangeRegistrar* registrar() const {
+    return registrar_.get();
+  }
+
+ private:
+  virtual void SetUpInProcessBrowserTestFixture() OVERRIDE {
+    EXPECT_CALL(policy_provider_, IsInitializationComplete(_))
+        .WillRepeatedly(Return(true));
+    EXPECT_CALL(policy_provider_, RegisterPolicyDomain(_)).Times(AnyNumber());
+    policy::BrowserPolicyConnector::SetPolicyProviderForTesting(
+        &policy_provider_);
+  }
+
+  virtual void SetUpOnMainThread() OVERRIDE {
+    prefs_ = PrefServiceSyncable::FromProfile(browser()->profile());
+    syncer_ = prefs_->GetSyncableService(syncer::PREFERENCES);
+    syncer_->MergeDataAndStartSyncing(
+        syncer::PREFERENCES,
+        syncer::SyncDataList(),
+        scoped_ptr<syncer::SyncChangeProcessor>(new TestSyncProcessorStub),
+        scoped_ptr<syncer::SyncErrorFactory>(new syncer::SyncErrorFactoryMock));
+    registrar_.reset(new SyncedPrefChangeRegistrar(prefs_));
+  }
+
+  virtual void CleanUpOnMainThread() OVERRIDE {
+    registrar_.reset();
+  }
+
+  PrefServiceSyncable* prefs_;
+  syncer::SyncableService* syncer_;
+  int next_sync_data_id_;
+
+  scoped_ptr<SyncedPrefChangeRegistrar> registrar_;
+  policy::MockConfigurationPolicyProvider policy_provider_;
+};
+
+struct TestSyncedPrefObserver {
+  bool last_seen_value;
+  bool last_update_is_from_sync;
+  bool has_been_notified;
+};
+
+void TestPrefChangeCallback(PrefService* prefs,
+                            TestSyncedPrefObserver* observer,
+                            const std::string& path,
+                            bool from_sync) {
+  observer->last_seen_value = prefs->GetBoolean(path.c_str());
+  observer->last_update_is_from_sync = from_sync;
+  observer->has_been_notified = true;
+}
+
+}  // namespace
+
+IN_PROC_BROWSER_TEST_F(SyncedPrefChangeRegistrarTest,
+                       DifferentiateRemoteAndLocalChanges) {
+  TestSyncedPrefObserver observer = {};
+  registrar()->Add(prefs::kShowHomeButton,
+      base::Bind(&TestPrefChangeCallback, prefs(), &observer));
+
+  EXPECT_FALSE(observer.has_been_notified);
+
+  SetBooleanPrefValueFromSync(prefs::kShowHomeButton, true);
+  EXPECT_TRUE(observer.has_been_notified);
+  EXPECT_TRUE(GetBooleanPrefValue(prefs::kShowHomeButton));
+  EXPECT_TRUE(observer.last_update_is_from_sync);
+  EXPECT_TRUE(observer.last_seen_value);
+
+  observer.has_been_notified = false;
+  SetBooleanPrefValueFromLocal(prefs::kShowHomeButton, false);
+  EXPECT_TRUE(observer.has_been_notified);
+  EXPECT_FALSE(GetBooleanPrefValue(prefs::kShowHomeButton));
+  EXPECT_FALSE(observer.last_update_is_from_sync);
+  EXPECT_FALSE(observer.last_seen_value);
+
+  observer.has_been_notified = false;
+  SetBooleanPrefValueFromLocal(prefs::kShowHomeButton, true);
+  EXPECT_TRUE(observer.has_been_notified);
+  EXPECT_TRUE(GetBooleanPrefValue(prefs::kShowHomeButton));
+  EXPECT_FALSE(observer.last_update_is_from_sync);
+  EXPECT_TRUE(observer.last_seen_value);
+
+  observer.has_been_notified = false;
+  SetBooleanPrefValueFromSync(prefs::kShowHomeButton, false);
+  EXPECT_TRUE(observer.has_been_notified);
+  EXPECT_FALSE(GetBooleanPrefValue(prefs::kShowHomeButton));
+  EXPECT_TRUE(observer.last_update_is_from_sync);
+  EXPECT_FALSE(observer.last_seen_value);
+}
+
+IN_PROC_BROWSER_TEST_F(SyncedPrefChangeRegistrarTest,
+                       IgnoreLocalChangesToManagedPrefs) {
+  TestSyncedPrefObserver observer = {};
+  registrar()->Add(prefs::kShowHomeButton,
+      base::Bind(&TestPrefChangeCallback, prefs(), &observer));
+
+  policy::PolicyMap policies;
+  policies.Set(policy::key::kShowHomeButton,
+               policy::POLICY_LEVEL_MANDATORY,
+               policy::POLICY_SCOPE_USER,
+               base::Value::CreateBooleanValue(true),
+               NULL);
+  UpdateChromePolicy(policies);
+
+  EXPECT_TRUE(prefs()->IsManagedPreference(prefs::kShowHomeButton));
+
+  SetBooleanPrefValueFromLocal(prefs::kShowHomeButton, false);
+  EXPECT_FALSE(observer.has_been_notified);
+  EXPECT_TRUE(GetBooleanPrefValue(prefs::kShowHomeButton));
+}
+
+IN_PROC_BROWSER_TEST_F(SyncedPrefChangeRegistrarTest,
+                       IgnoreSyncChangesToManagedPrefs) {
+  TestSyncedPrefObserver observer = {};
+  registrar()->Add(prefs::kShowHomeButton,
+      base::Bind(&TestPrefChangeCallback, prefs(), &observer));
+
+  policy::PolicyMap policies;
+  policies.Set(policy::key::kShowHomeButton,
+               policy::POLICY_LEVEL_MANDATORY,
+               policy::POLICY_SCOPE_USER,
+               base::Value::CreateBooleanValue(true),
+               NULL);
+  UpdateChromePolicy(policies);
+
+  EXPECT_TRUE(prefs()->IsManagedPreference(prefs::kShowHomeButton));
+  SetBooleanPrefValueFromSync(prefs::kShowHomeButton, false);
+  EXPECT_FALSE(observer.has_been_notified);
+  EXPECT_TRUE(GetBooleanPrefValue(prefs::kShowHomeButton));
+}