Device info datatype should be moved to components/sync_driver.

Moving device_info* and local_device_info_provider.h to components/sync_driver
and updating namespaces for the related classes from browsing_sync to sync_driver.

Most of the changes are mechanical - trivial changes of header files and namespaces.
There are just few less trivial changes:
1) I've removed GetClientName from DeviceInfo because it depended on content/public.
Instead I've inlined GetClientName code (which is rather trivial) in two places where
it was used, including supervised_user_registration_utility.cc.
That required me to update DEPS file for supervised_user. There isn't anything new
in reality - these dependencies already existed indirectly.
2) Added two extra parameters to DeviceInfoDataTypeController to avoid having
direct dependencies on the browser.

TBR=pkasting@chromium.org,yoz@chromium.org
BUG=396136

Review URL: https://codereview.chromium.org/597423002

Cr-Commit-Position: refs/heads/master@{#296895}

1 files changed, 343 insertions, 0 deletions

diff --git a/components/sync_driver/device_info_sync_service.cc b/components/sync_driver/device_info_sync_service.cc
new file mode 100644
index 0000000..cdb98e1
--- /dev/null
+++ b/components/sync_driver/device_info_sync_service.cc
@@ -0,0 +1,343 @@
+// Copyright 2014 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/sync_driver/device_info_sync_service.h"
+
+#include "base/strings/stringprintf.h"
+#include "components/sync_driver/local_device_info_provider.h"
+#include "sync/api/sync_change.h"
+#include "sync/protocol/sync.pb.h"
+#include "sync/util/time.h"
+
+namespace sync_driver {
+
+using syncer::ModelType;
+using syncer::SyncChange;
+using syncer::SyncChangeList;
+using syncer::SyncChangeProcessor;
+using syncer::SyncData;
+using syncer::SyncDataList;
+using syncer::SyncErrorFactory;
+using syncer::SyncMergeResult;
+
+DeviceInfoSyncService::DeviceInfoSyncService(
+    LocalDeviceInfoProvider* local_device_info_provider)
+    : local_device_backup_time_(-1),
+      local_device_info_provider_(local_device_info_provider) {
+  DCHECK(local_device_info_provider);
+}
+
+DeviceInfoSyncService::~DeviceInfoSyncService() {
+}
+
+SyncMergeResult DeviceInfoSyncService::MergeDataAndStartSyncing(
+    ModelType type,
+    const SyncDataList& initial_sync_data,
+    scoped_ptr<SyncChangeProcessor> sync_processor,
+    scoped_ptr<SyncErrorFactory> error_handler) {
+  DCHECK(sync_processor.get());
+  DCHECK(error_handler.get());
+  DCHECK_EQ(type, syncer::DEVICE_INFO);
+
+  DCHECK(all_data_.empty());
+
+  sync_processor_ = sync_processor.Pass();
+  error_handler_ = error_handler.Pass();
+
+  // Initialization should be completed before this type is enabled
+  // and local device info must be available.
+  const DeviceInfo* local_device_info =
+      local_device_info_provider_->GetLocalDeviceInfo();
+  DCHECK(local_device_info != NULL);
+
+  // Indicates whether a local device has been added or updated.
+  // |change_type| defaults to ADD and might be changed to
+  // UPDATE to INVALID down below if the initial data contains
+  // data matching the local device ID.
+  SyncChange::SyncChangeType change_type = SyncChange::ACTION_ADD;
+  size_t num_items_new = 0;
+  size_t num_items_updated = 0;
+
+  // Iterate over all initial sync data and copy it to the cache.
+  for (SyncDataList::const_iterator iter = initial_sync_data.begin();
+       iter != initial_sync_data.end();
+       ++iter) {
+    DCHECK_EQ(syncer::DEVICE_INFO, iter->GetDataType());
+
+    const std::string& id = iter->GetSpecifics().device_info().cache_guid();
+
+    if (id == local_device_info->guid()) {
+      // |initial_sync_data| contains data matching the local device.
+      scoped_ptr<DeviceInfo> synced_local_device_info =
+          make_scoped_ptr(CreateDeviceInfo(*iter));
+
+      // Retrieve local device backup timestamp value from the sync data.
+      bool has_synced_backup_time =
+          iter->GetSpecifics().device_info().has_backup_timestamp();
+      int64 synced_backup_time =
+          has_synced_backup_time
+              ? iter->GetSpecifics().device_info().backup_timestamp()
+              : -1;
+
+      // Overwrite |local_device_backup_time_| with this value if it
+      // hasn't been set yet.
+      if (!has_local_device_backup_time() && has_synced_backup_time) {
+        set_local_device_backup_time(synced_backup_time);
+      }
+
+      // Store the synced device info for the local device only
+      // it is the same as the local info. Otherwise store the local
+      // device info and issue a change further below after finishing
+      // processing the |initial_sync_data|.
+      if (synced_local_device_info->Equals(*local_device_info) &&
+          synced_backup_time == local_device_backup_time()) {
+        change_type = SyncChange::ACTION_INVALID;
+      } else {
+        num_items_updated++;
+        change_type = SyncChange::ACTION_UPDATE;
+        continue;
+      }
+    } else {
+      // A new device that doesn't match the local device.
+      num_items_new++;
+    }
+
+    StoreSyncData(id, *iter);
+  }
+
+  syncer::SyncMergeResult result(type);
+
+  // Add SyncData for the local device if it is new or different than
+  // the synced one, and also add it to the |change_list|.
+  if (change_type != SyncChange::ACTION_INVALID) {
+    SyncData local_data = CreateLocalData(local_device_info);
+    StoreSyncData(local_device_info->guid(), local_data);
+
+    SyncChangeList change_list;
+    change_list.push_back(SyncChange(FROM_HERE, change_type, local_data));
+    result.set_error(
+        sync_processor_->ProcessSyncChanges(FROM_HERE, change_list));
+  }
+
+  result.set_num_items_before_association(1);
+  result.set_num_items_after_association(all_data_.size());
+  result.set_num_items_added(num_items_new);
+  result.set_num_items_modified(num_items_updated);
+  result.set_num_items_deleted(0);
+
+  NotifyObservers();
+
+  return result;
+}
+
+void DeviceInfoSyncService::StopSyncing(syncer::ModelType type) {
+  all_data_.clear();
+  sync_processor_.reset();
+  error_handler_.reset();
+  clear_local_device_backup_time();
+}
+
+SyncDataList DeviceInfoSyncService::GetAllSyncData(
+    syncer::ModelType type) const {
+  SyncDataList list;
+
+  for (SyncDataMap::const_iterator iter = all_data_.begin();
+       iter != all_data_.end();
+       ++iter) {
+    list.push_back(iter->second);
+  }
+
+  return list;
+}
+
+syncer::SyncError DeviceInfoSyncService::ProcessSyncChanges(
+    const tracked_objects::Location& from_here,
+    const SyncChangeList& change_list) {
+  syncer::SyncError error;
+
+  DCHECK(local_device_info_provider_->GetLocalDeviceInfo());
+  const std::string& local_device_id =
+      local_device_info_provider_->GetLocalDeviceInfo()->guid();
+
+  bool has_changes = false;
+
+  // Iterate over all chanages and merge entries.
+  for (SyncChangeList::const_iterator iter = change_list.begin();
+       iter != change_list.end();
+       ++iter) {
+    const SyncData& sync_data = iter->sync_data();
+    DCHECK_EQ(syncer::DEVICE_INFO, sync_data.GetDataType());
+
+    const std::string& client_id =
+        sync_data.GetSpecifics().device_info().cache_guid();
+    // Ignore device info matching the local device.
+    if (local_device_id == client_id) {
+      DVLOG(1) << "Ignoring sync changes for the local DEVICE_INFO";
+      continue;
+    }
+
+    if (iter->change_type() == syncer::SyncChange::ACTION_DELETE) {
+      has_changes = true;
+      DeleteSyncData(client_id);
+    } else if (iter->change_type() == syncer::SyncChange::ACTION_UPDATE ||
+               iter->change_type() == syncer::SyncChange::ACTION_ADD) {
+      has_changes = true;
+      StoreSyncData(client_id, sync_data);
+    } else {
+      error.Reset(FROM_HERE, "Invalid action received.", syncer::DEVICE_INFO);
+    }
+  }
+
+  if (has_changes) {
+    NotifyObservers();
+  }
+
+  return error;
+}
+
+scoped_ptr<DeviceInfo> DeviceInfoSyncService::GetDeviceInfo(
+    const std::string& client_id) const {
+  SyncDataMap::const_iterator iter = all_data_.find(client_id);
+  if (iter == all_data_.end()) {
+    return scoped_ptr<DeviceInfo>();
+  }
+
+  return make_scoped_ptr(CreateDeviceInfo(iter->second));
+}
+
+ScopedVector<DeviceInfo> DeviceInfoSyncService::GetAllDeviceInfo() const {
+  ScopedVector<DeviceInfo> list;
+
+  for (SyncDataMap::const_iterator iter = all_data_.begin();
+       iter != all_data_.end();
+       ++iter) {
+    list.push_back(CreateDeviceInfo(iter->second));
+  }
+
+  return list.Pass();
+}
+
+void DeviceInfoSyncService::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void DeviceInfoSyncService::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void DeviceInfoSyncService::NotifyObservers() {
+  FOR_EACH_OBSERVER(Observer, observers_, OnDeviceInfoChange());
+}
+
+void DeviceInfoSyncService::UpdateLocalDeviceBackupTime(
+    base::Time backup_time) {
+  set_local_device_backup_time(syncer::TimeToProtoTime(backup_time));
+
+  if (sync_processor_.get()) {
+    // Local device info must be available in advance
+    DCHECK(local_device_info_provider_->GetLocalDeviceInfo());
+    const std::string& local_id =
+        local_device_info_provider_->GetLocalDeviceInfo()->guid();
+
+    SyncDataMap::iterator iter = all_data_.find(local_id);
+    DCHECK(iter != all_data_.end());
+
+    syncer::SyncData& data = iter->second;
+    if (UpdateBackupTime(&data)) {
+      // Local device backup time has changed.
+      // Push changes to the server via the |sync_processor_|.
+      SyncChangeList change_list;
+      change_list.push_back(SyncChange(
+          FROM_HERE, syncer::SyncChange::ACTION_UPDATE, data));
+      sync_processor_->ProcessSyncChanges(FROM_HERE, change_list);
+    }
+  }
+}
+
+bool DeviceInfoSyncService::UpdateBackupTime(syncer::SyncData* sync_data) {
+  DCHECK(has_local_device_backup_time());
+  DCHECK(sync_data->GetSpecifics().has_device_info());
+  const sync_pb::DeviceInfoSpecifics& source_specifics =
+      sync_data->GetSpecifics().device_info();
+
+  if (!source_specifics.has_backup_timestamp() ||
+      source_specifics.backup_timestamp() != local_device_backup_time()) {
+    sync_pb::EntitySpecifics entity(sync_data->GetSpecifics());
+    entity.mutable_device_info()->set_backup_timestamp(
+        local_device_backup_time());
+    *sync_data = CreateLocalData(entity);
+
+    return true;
+  }
+
+  return false;
+}
+
+base::Time DeviceInfoSyncService::GetLocalDeviceBackupTime() const {
+  return has_local_device_backup_time()
+             ? syncer::ProtoTimeToTime(local_device_backup_time())
+             : base::Time();
+}
+
+SyncData DeviceInfoSyncService::CreateLocalData(const DeviceInfo* info) {
+  sync_pb::EntitySpecifics entity;
+  sync_pb::DeviceInfoSpecifics& specifics = *entity.mutable_device_info();
+
+  specifics.set_cache_guid(info->guid());
+  specifics.set_client_name(info->client_name());
+  specifics.set_chrome_version(info->chrome_version());
+  specifics.set_sync_user_agent(info->sync_user_agent());
+  specifics.set_device_type(info->device_type());
+  specifics.set_signin_scoped_device_id(info->signin_scoped_device_id());
+
+  if (has_local_device_backup_time()) {
+    specifics.set_backup_timestamp(local_device_backup_time());
+  }
+
+  return CreateLocalData(entity);
+}
+
+SyncData DeviceInfoSyncService::CreateLocalData(
+    const sync_pb::EntitySpecifics& entity) {
+  const sync_pb::DeviceInfoSpecifics& specifics = entity.device_info();
+
+  std::string local_device_tag =
+      base::StringPrintf("DeviceInfo_%s", specifics.cache_guid().c_str());
+
+  return SyncData::CreateLocalData(
+      local_device_tag, specifics.client_name(), entity);
+}
+
+DeviceInfo* DeviceInfoSyncService::CreateDeviceInfo(
+    const syncer::SyncData sync_data) {
+  const sync_pb::DeviceInfoSpecifics& specifics =
+      sync_data.GetSpecifics().device_info();
+
+  return new DeviceInfo(specifics.cache_guid(),
+                        specifics.client_name(),
+                        specifics.chrome_version(),
+                        specifics.sync_user_agent(),
+                        specifics.device_type(),
+                        specifics.signin_scoped_device_id());
+}
+
+void DeviceInfoSyncService::StoreSyncData(const std::string& client_id,
+                                          const SyncData& sync_data) {
+  DVLOG(1) << "Storing DEVICE_INFO for "
+           << sync_data.GetSpecifics().device_info().client_name()
+           << " with ID " << client_id;
+  all_data_[client_id] = sync_data;
+}
+
+void DeviceInfoSyncService::DeleteSyncData(const std::string& client_id) {
+  SyncDataMap::iterator iter = all_data_.find(client_id);
+  if (iter != all_data_.end()) {
+    DVLOG(1) << "Deleting DEVICE_INFO for "
+             << iter->second.GetSpecifics().device_info().client_name()
+             << " with ID " << client_id;
+    all_data_.erase(iter);
+  }
+}
+
+}  // namespace sync_driver