Port messages sent by WebIDBDatabaseImpl to Mojo.

content/browser/indexed_db/database_impl.cc

+// Copyright 2016 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 "content/browser/indexed_db/database_impl.h"
+
+#include "content/browser/bad_message.h"
+#include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/indexed_db/indexed_db_connection.h"
+#include "content/browser/indexed_db/indexed_db_context_impl.h"
+#include "content/browser/indexed_db/indexed_db_dispatcher_host.h"
+#include "content/browser/indexed_db/indexed_db_value.h"
+#include "content/common/indexed_db/indexed_db_messages.h"
+#include "storage/browser/blob/blob_storage_context.h"
+#include "storage/browser/quota/quota_manager_proxy.h"
+#include "third_party/WebKit/public/platform/modules/indexeddb/WebIDBDatabaseException.h"
+
+using std::swap;
+
+namespace content {
+
+namespace {
+const char kInvalidBlobUuid[] = "Blob UUID is invalid";
+}  // namespace
+
+class DatabaseImpl::IDBThreadHelper {
+ public:
+  IDBThreadHelper(std::unique_ptr<IndexedDBConnection> connection,
+                  const url::Origin& origin,
+                  scoped_refptr<IndexedDBDispatcherHost> dispatcher_host);
+  ~IDBThreadHelper();
+
+  void CreateObjectStore(int64_t transaction_id,
+                         int64_t object_store_id,
+                         const base::string16& name,
+                         const IndexedDBKeyPath& key_path,
+                         bool auto_increment);
+  void DeleteObjectStore(int64_t transaction_id, int64_t object_store_id);
+  void RenameObjectStore(int64_t transaction_id,
+                         int64_t object_store_id,
+                         const base::string16& new_name);
+  void CreateTransaction(int64_t transaction_id,
+                         const std::vector<int64_t>& object_store_ids,
+                         blink::WebIDBTransactionMode mode);
+  void Close();
+  void VersionChangeIgnored();
+  void AddObserver(int64_t transaction_id,
+                   int32_t observer_id,
+                   bool include_transaction,
+                   bool no_records,
+                   bool values,
+                   uint16_t operation_types);
+  void RemoveObservers(const std::vector<int32_t>& observers);
+  void Get(int64_t transaction_id,
+           int64_t object_store_id,
+           int64_t index_id,
+           const IndexedDBKeyRange& key_range,
+           bool key_only,
+           scoped_refptr<IndexedDBCallbacks> callbacks);
+  void GetAll(int64_t transaction_id,
+              int64_t object_store_id,
+              int64_t index_id,
+              const IndexedDBKeyRange& key_range,
+              bool key_only,
+              int64_t max_count,
+              scoped_refptr<IndexedDBCallbacks> callbacks);
+  void Put(int64_t transaction_id,
+           int64_t object_store_id,
+           ::indexed_db::mojom::ValuePtr value,
+           std::vector<std::unique_ptr<storage::BlobDataHandle>> handles,
+           const IndexedDBKey& key,
+           blink::WebIDBPutMode mode,
+           const std::vector<IndexedDBIndexKeys>& index_keys,
+           scoped_refptr<IndexedDBCallbacks> callbacks);
+  void SetIndexKeys(int64_t transaction_id,
+                    int64_t object_store_id,
+                    const IndexedDBKey& primary_key,
+                    const std::vector<IndexedDBIndexKeys>& index_keys);
+  void SetIndexesReady(int64_t transaction_id,
+                       int64_t object_store_id,
+                       const std::vector<int64_t>& index_ids);
+  void OpenCursor(int64_t transaction_id,
+                  int64_t object_store_id,
+                  int64_t index_id,
+                  const IndexedDBKeyRange& key_range,
+                  blink::WebIDBCursorDirection direction,
+                  bool key_only,
+                  blink::WebIDBTaskType task_type,
+                  scoped_refptr<IndexedDBCallbacks> callbacks);
+  void Count(int64_t transaction_id,
+             int64_t object_store_id,
+             int64_t index_id,
+             const IndexedDBKeyRange& key_range,
+             scoped_refptr<IndexedDBCallbacks> callbacks);
+  void DeleteRange(int64_t transaction_id,
+                   int64_t object_store_id,
+                   const IndexedDBKeyRange& key_range,
+                   scoped_refptr<IndexedDBCallbacks> callbacks);
+  void Clear(int64_t transaction_id,
+             int64_t object_store_id,
+             scoped_refptr<IndexedDBCallbacks> callbacks);
+  void CreateIndex(int64_t transaction_id,
+                   int64_t object_store_id,
+                   int64_t index_id,
+                   const base::string16& name,
+                   const IndexedDBKeyPath& key_path,
+                   bool unique,
+                   bool multi_entry);
+  void DeleteIndex(int64_t transaction_id,
+                   int64_t object_store_id,
+                   int64_t index_id);
+  void RenameIndex(int64_t transaction_id,
+                   int64_t object_store_id,
+                   int64_t index_id,
+                   const base::string16& new_name);
+  void Abort(int64_t transaction_id);
+  void Commit(int64_t transaction_id);
+  void OnGotUsageAndQuotaForCommit(int64_t transaction_id,
+                                   storage::QuotaStatusCode status,
+                                   int64_t usage,
+                                   int64_t quota);
+  void AckReceivedBlobs(const std::vector<std::string>& uuids);
+
+ private:
+  scoped_refptr<IndexedDBDispatcherHost> dispatcher_host_;
+  std::unique_ptr<IndexedDBConnection> connection_;
+  const url::Origin origin_;
+  base::WeakPtrFactory<IDBThreadHelper> weak_factory_;
+};
+
+DatabaseImpl::DatabaseImpl(
+    std::unique_ptr<IndexedDBConnection> connection,
+    const url::Origin& origin,
+    scoped_refptr<IndexedDBDispatcherHost> dispatcher_host)
+    : dispatcher_host_(dispatcher_host),
+      origin_(origin),
+      idb_runner_(base::ThreadTaskRunnerHandle::Get()) {
+  helper_ = new IDBThreadHelper(std::move(connection), origin,
+                                std::move(dispatcher_host));
+}
+
+DatabaseImpl::~DatabaseImpl() {
+  idb_runner_->DeleteSoon(FROM_HERE, helper_);
+}
+
+void DatabaseImpl::CreateObjectStore(int64_t transaction_id,
+                                     int64_t object_store_id,
+                                     const base::string16& name,
+                                     const IndexedDBKeyPath& key_path,
+                                     bool auto_increment) {
+  idb_runner_->PostTask(
+      FROM_HERE, base::Bind(&IDBThreadHelper::CreateObjectStore,
+                            base::Unretained(helper_), transaction_id,
+                            object_store_id, name, key_path, auto_increment));
+}
+
+void DatabaseImpl::DeleteObjectStore(int64_t transaction_id,
+                                     int64_t object_store_id) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::DeleteObjectStore, base::Unretained(helper_),
+                 transaction_id, object_store_id));
+}
+
+void DatabaseImpl::RenameObjectStore(int64_t transaction_id,
+                                     int64_t object_store_id,
+                                     const base::string16& new_name) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::RenameObjectStore, base::Unretained(helper_),
+                 transaction_id, object_store_id, new_name));
+}
+
+void DatabaseImpl::CreateTransaction(
+    int64_t transaction_id,
+    const std::vector<int64_t>& object_store_ids,
+    blink::WebIDBTransactionMode mode) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::CreateTransaction, base::Unretained(helper_),
+                 transaction_id, object_store_ids, mode));
+}
+
+void DatabaseImpl::Close() {
+  idb_runner_->PostTask(FROM_HERE, base::Bind(&IDBThreadHelper::Close,
+                                              base::Unretained(helper_)));
+}
+
+void DatabaseImpl::VersionChangeIgnored() {
+  idb_runner_->PostTask(FROM_HERE,
+                        base::Bind(&IDBThreadHelper::VersionChangeIgnored,
+                                   base::Unretained(helper_)));
+}
+
+void DatabaseImpl::AddObserver(int64_t transaction_id,
+                               int32_t observer_id,
+                               bool include_transaction,
+                               bool no_records,
+                               bool values,
+                               uint16_t operation_types) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::AddObserver, base::Unretained(helper_),
+                 transaction_id, observer_id, include_transaction, no_records,
+                 values, operation_types));
+}
+
+void DatabaseImpl::RemoveObservers(const std::vector<int32_t>& observers) {
+  idb_runner_->PostTask(FROM_HERE,
+                        base::Bind(&IDBThreadHelper::RemoveObservers,
+                                   base::Unretained(helper_), observers));
+}
+
+void DatabaseImpl::Get(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    bool key_only,
+    ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info) {
+  scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
+      dispatcher_host_.get(), origin_, std::move(callbacks_info)));
+  idb_runner_->PostTask(
+      FROM_HERE, base::Bind(&IDBThreadHelper::Get, base::Unretained(helper_),
+                            transaction_id, object_store_id, index_id,
+                            key_range, key_only, base::Passed(&callbacks)));
+}
+
+void DatabaseImpl::GetAll(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    bool key_only,
+    int64_t max_count,
+    ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info) {
+  scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
+      dispatcher_host_.get(), origin_, std::move(callbacks_info)));
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::GetAll, base::Unretained(helper_),
+                 transaction_id, object_store_id, index_id, key_range, key_only,
+                 max_count, base::Passed(&callbacks)));
+}
+
+void DatabaseImpl::Put(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    ::indexed_db::mojom::ValuePtr value,
+    const IndexedDBKey& key,
+    blink::WebIDBPutMode mode,
+    const std::vector<IndexedDBIndexKeys>& index_keys,
+    ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info) {
+  std::vector<std::unique_ptr<storage::BlobDataHandle>> handles;
+  for (const auto& info : value->blob_or_file_info) {
+    std::unique_ptr<storage::BlobDataHandle> handle =
+        dispatcher_host_->blob_storage_context()->GetBlobDataFromUUID(
+            info->uuid);
+    if (!handle) {
+      mojo::ReportBadMessage(kInvalidBlobUuid);
+      return;
+    }
+    handles.push_back(std::move(handle));
+  }
+
+  scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
+      dispatcher_host_.get(), origin_, std::move(callbacks_info)));
+
+  idb_runner_->PostTask(
+      FROM_HERE, base::Bind(&IDBThreadHelper::Put, base::Unretained(helper_),
+                            transaction_id, object_store_id,
+                            base::Passed(&value), base::Passed(&handles), key,
+                            mode, index_keys, base::Passed(&callbacks)));
+}
+
+void DatabaseImpl::SetIndexKeys(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    const IndexedDBKey& primary_key,
+    const std::vector<IndexedDBIndexKeys>& index_keys) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::SetIndexKeys, base::Unretained(helper_),
+                 transaction_id, object_store_id, primary_key, index_keys));
+}
+
+void DatabaseImpl::SetIndexesReady(int64_t transaction_id,
+                                   int64_t object_store_id,
+                                   const std::vector<int64_t>& index_ids) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::SetIndexesReady, base::Unretained(helper_),
+                 transaction_id, object_store_id, index_ids));
+}
+
+void DatabaseImpl::OpenCursor(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    blink::WebIDBCursorDirection direction,
+    bool key_only,
+    blink::WebIDBTaskType task_type,
+    ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info) {
+  scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
+      dispatcher_host_.get(), origin_, std::move(callbacks_info)));
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::OpenCursor, base::Unretained(helper_),
+                 transaction_id, object_store_id, index_id, key_range,
+                 direction, key_only, task_type, base::Passed(&callbacks)));
+}
+
+void DatabaseImpl::Count(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info) {
+  scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
+      dispatcher_host_.get(), origin_, std::move(callbacks_info)));
+  idb_runner_->PostTask(
+      FROM_HERE, base::Bind(&IDBThreadHelper::Count, base::Unretained(helper_),
+                            transaction_id, object_store_id, index_id,
+                            key_range, base::Passed(&callbacks)));
+}
+
+void DatabaseImpl::DeleteRange(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    const IndexedDBKeyRange& key_range,
+    ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info) {
+  scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
+      dispatcher_host_.get(), origin_, std::move(callbacks_info)));
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::DeleteRange, base::Unretained(helper_),
+                 transaction_id, object_store_id, key_range,
+                 base::Passed(&callbacks)));
+}
+
+void DatabaseImpl::Clear(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    ::indexed_db::mojom::CallbacksAssociatedPtrInfo callbacks_info) {
+  scoped_refptr<IndexedDBCallbacks> callbacks(new IndexedDBCallbacks(
+      dispatcher_host_.get(), origin_, std::move(callbacks_info)));
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::Clear, base::Unretained(helper_),
+                 transaction_id, object_store_id, base::Passed(&callbacks)));
+}
+
+void DatabaseImpl::CreateIndex(int64_t transaction_id,
+                               int64_t object_store_id,
+                               int64_t index_id,
+                               const base::string16& name,
+                               const IndexedDBKeyPath& key_path,
+                               bool unique,
+                               bool multi_entry) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::CreateIndex, base::Unretained(helper_),
+                 transaction_id, object_store_id, index_id, name, key_path,
+                 unique, multi_entry));
+}
+
+void DatabaseImpl::DeleteIndex(int64_t transaction_id,
+                               int64_t object_store_id,
+                               int64_t index_id) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::DeleteIndex, base::Unretained(helper_),
+                 transaction_id, object_store_id, index_id));
+}
+
+void DatabaseImpl::RenameIndex(int64_t transaction_id,
+                               int64_t object_store_id,
+                               int64_t index_id,
+                               const base::string16& new_name) {
+  idb_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&IDBThreadHelper::RenameIndex, base::Unretained(helper_),
+                 transaction_id, object_store_id, index_id, new_name));
+}
+
+void DatabaseImpl::Abort(int64_t transaction_id) {
+  idb_runner_->PostTask(
+      FROM_HERE, base::Bind(&IDBThreadHelper::Abort, base::Unretained(helper_),
+                            transaction_id));
+}
+
+void DatabaseImpl::Commit(int64_t transaction_id) {
+  idb_runner_->PostTask(
+      FROM_HERE, base::Bind(&IDBThreadHelper::Commit, base::Unretained(helper_),
+                            transaction_id));
+}
+
+void DatabaseImpl::AckReceivedBlobs(const std::vector<std::string>& uuids) {
+  for (const auto& uuid : uuids)
+    dispatcher_host_->DropBlobData(uuid);
+}
+
+DatabaseImpl::IDBThreadHelper::IDBThreadHelper(
+    std::unique_ptr<IndexedDBConnection> connection,
+    const url::Origin& origin,
+    scoped_refptr<IndexedDBDispatcherHost> dispatcher_host)
+    : dispatcher_host_(std::move(dispatcher_host)),
+      connection_(std::move(connection)),
+      origin_(origin),
+      weak_factory_(this) {
+  dispatcher_host_->context()->ConnectionOpened(origin_, connection.get());
+}
+
+DatabaseImpl::IDBThreadHelper::~IDBThreadHelper() {
+  if (connection_->IsConnected())
+    connection_->Close();
+  dispatcher_host_->context()->ConnectionClosed(origin_, connection_.get());
+}
+
+void DatabaseImpl::IDBThreadHelper::CreateObjectStore(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    const base::string16& name,
+    const IndexedDBKeyPath& key_path,
+    bool auto_increment) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->CreateObjectStore(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      name, key_path, auto_increment);
+}
+
+void DatabaseImpl::IDBThreadHelper::DeleteObjectStore(int64_t transaction_id,
+                                                      int64_t object_store_id) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->DeleteObjectStore(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id);
+}
+
+void DatabaseImpl::IDBThreadHelper::RenameObjectStore(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    const base::string16& new_name) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->RenameObjectStore(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      new_name);
+}
+
+void DatabaseImpl::IDBThreadHelper::CreateTransaction(
+    int64_t transaction_id,
+    const std::vector<int64_t>& object_store_ids,
+    blink::WebIDBTransactionMode mode) {
+  if (!connection_->IsConnected())
+    return;
+
+  int64_t host_transaction_id =
+      dispatcher_host_->HostTransactionId(transaction_id);
+  if (!dispatcher_host_->RegisterTransactionId(host_transaction_id, origin_)) {
+    DLOG(ERROR) << "Duplicate host_transaction_id.";
+    return;
+  }
+
+  connection_->database()->CreateTransaction(
+      host_transaction_id, connection_.get(), object_store_ids, mode);
+}
+
+void DatabaseImpl::IDBThreadHelper::Close() {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->Close();
+}
+
+void DatabaseImpl::IDBThreadHelper::VersionChangeIgnored() {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->VersionChangeIgnored();
+}
+
+void DatabaseImpl::IDBThreadHelper::AddObserver(int64_t transaction_id,
+                                                int32_t observer_id,
+                                                bool include_transaction,
+                                                bool no_records,
+                                                bool values,
+                                                uint16_t operation_types) {
+  if (!connection_->IsConnected())
+    return;
+
+  IndexedDBObserver::Options options(include_transaction, no_records, values,
+                                     operation_types);
+  connection_->database()->AddPendingObserver(
+      dispatcher_host_->HostTransactionId(transaction_id), observer_id,
+      options);
+}
+
+void DatabaseImpl::IDBThreadHelper::RemoveObservers(
+    const std::vector<int32_t>& observers) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->RemoveObservers(observers);
+}
+
+void DatabaseImpl::IDBThreadHelper::Get(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    bool key_only,
+    scoped_refptr<IndexedDBCallbacks> callbacks) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->Get(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_id, base::MakeUnique<IndexedDBKeyRange>(key_range), key_only,
+      callbacks);
+}
+
+void DatabaseImpl::IDBThreadHelper::GetAll(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    bool key_only,
+    int64_t max_count,
+    scoped_refptr<IndexedDBCallbacks> callbacks) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->GetAll(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_id, base::MakeUnique<IndexedDBKeyRange>(key_range), key_only,
+      max_count, std::move(callbacks));
+}
+
+void DatabaseImpl::IDBThreadHelper::Put(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    ::indexed_db::mojom::ValuePtr mojo_value,
+    std::vector<std::unique_ptr<storage::BlobDataHandle>> handles,
+    const IndexedDBKey& key,
+    blink::WebIDBPutMode mode,
+    const std::vector<IndexedDBIndexKeys>& index_keys,
+    scoped_refptr<IndexedDBCallbacks> callbacks) {
+  if (!connection_->IsConnected())
+    return;
+
+  int64_t host_transaction_id =
+      dispatcher_host_->HostTransactionId(transaction_id);
+
+  ChildProcessSecurityPolicyImpl* policy =
+      ChildProcessSecurityPolicyImpl::GetInstance();
+  std::vector<IndexedDBBlobInfo> blob_info(
+      mojo_value->blob_or_file_info.size());
+  for (size_t i = 0; i < mojo_value->blob_or_file_info.size(); ++i) {
+    const auto& info = mojo_value->blob_or_file_info[i];
+    if (info->file) {
+      if (!info->file->path.empty()) {
+        if (!policy->CanReadFile(dispatcher_host_->ipc_process_id(),
+                                 info->file->path)) {
+          bad_message::ReceivedBadMessage(dispatcher_host_.get(),
+                                          bad_message::IDBDH_CAN_READ_FILE);
+          return;
+        }
+      }
+      blob_info[i] = IndexedDBBlobInfo(info->uuid, info->file->path,
+                                       info->file->name, info->mime_type);
+      if (info->size != static_cast<uint64_t>(-1)) {
+        blob_info[i].set_last_modified(info->file->last_modified);
+        blob_info[i].set_size(info->size);
+      }
+    } else {
+      blob_info[i] = IndexedDBBlobInfo(info->uuid, info->mime_type, info->size);
+    }
+  }
+
+  uint64_t commit_size = mojo_value->bits.size();
+  IndexedDBValue value;
+  swap(value.bits, mojo_value->bits);
+  swap(value.blob_info, blob_info);
+  connection_->database()->Put(host_transaction_id, object_store_id, &value,
+                               &handles, base::MakeUnique<IndexedDBKey>(key),
+                               mode, std::move(callbacks), index_keys);
+
+  // Size can't be big enough to overflow because it represents the
+  // actual bytes passed through IPC.
+  dispatcher_host_->AddToTransaction(host_transaction_id, commit_size);
+}
+
+void DatabaseImpl::IDBThreadHelper::SetIndexKeys(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    const IndexedDBKey& primary_key,
+    const std::vector<IndexedDBIndexKeys>& index_keys) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->SetIndexKeys(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      base::MakeUnique<IndexedDBKey>(primary_key), index_keys);
+}
+
+void DatabaseImpl::IDBThreadHelper::SetIndexesReady(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    const std::vector<int64_t>& index_ids) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->SetIndexesReady(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_ids);
+}
+
+void DatabaseImpl::IDBThreadHelper::OpenCursor(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    blink::WebIDBCursorDirection direction,
+    bool key_only,
+    blink::WebIDBTaskType task_type,
+    scoped_refptr<IndexedDBCallbacks> callbacks) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->OpenCursor(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_id, base::MakeUnique<IndexedDBKeyRange>(key_range), direction,
+      key_only, task_type, std::move(callbacks));
+}
+
+void DatabaseImpl::IDBThreadHelper::Count(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const IndexedDBKeyRange& key_range,
+    scoped_refptr<IndexedDBCallbacks> callbacks) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->Count(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_id, base::MakeUnique<IndexedDBKeyRange>(key_range),
+      std::move(callbacks));
+}
+
+void DatabaseImpl::IDBThreadHelper::DeleteRange(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    const IndexedDBKeyRange& key_range,
+    scoped_refptr<IndexedDBCallbacks> callbacks) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->DeleteRange(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      base::MakeUnique<IndexedDBKeyRange>(key_range), std::move(callbacks));
+}
+
+void DatabaseImpl::IDBThreadHelper::Clear(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    scoped_refptr<IndexedDBCallbacks> callbacks) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->Clear(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      callbacks);
+}
+
+void DatabaseImpl::IDBThreadHelper::CreateIndex(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const base::string16& name,
+    const IndexedDBKeyPath& key_path,
+    bool unique,
+    bool multi_entry) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->CreateIndex(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_id, name, key_path, unique, multi_entry);
+}
+
+void DatabaseImpl::IDBThreadHelper::DeleteIndex(int64_t transaction_id,
+                                                int64_t object_store_id,
+                                                int64_t index_id) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->DeleteIndex(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_id);
+}
+
+void DatabaseImpl::IDBThreadHelper::RenameIndex(
+    int64_t transaction_id,
+    int64_t object_store_id,
+    int64_t index_id,
+    const base::string16& new_name) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->RenameIndex(
+      dispatcher_host_->HostTransactionId(transaction_id), object_store_id,
+      index_id, new_name);
+}
+
+void DatabaseImpl::IDBThreadHelper::Abort(int64_t transaction_id) {
+  if (!connection_->IsConnected())
+    return;
+
+  connection_->database()->Abort(
+      dispatcher_host_->HostTransactionId(transaction_id));
+}
+
+void DatabaseImpl::IDBThreadHelper::Commit(int64_t transaction_id) {
+  if (!connection_->IsConnected())
+    return;
+
+  int64_t host_transaction_id =
+      dispatcher_host_->HostTransactionId(transaction_id);
+  // May have been aborted by back end before front-end could request commit.
+  int64_t transaction_size;
+  if (!dispatcher_host_->GetTransactionSize(host_transaction_id,
+                                            &transaction_size))
+    return;
+
+  // Always allow empty or delete-only transactions.
+  if (transaction_size == 0) {
+    connection_->database()->Commit(host_transaction_id);
+    return;
+  }
+
+  dispatcher_host_->context()->quota_manager_proxy()->GetUsageAndQuota(
+      dispatcher_host_->context()->TaskRunner(), origin_.GetURL(),
+      storage::kStorageTypeTemporary,
+      base::Bind(&IDBThreadHelper::OnGotUsageAndQuotaForCommit,
+                 weak_factory_.GetWeakPtr(), transaction_id));
+}
+
+void DatabaseImpl::IDBThreadHelper::OnGotUsageAndQuotaForCommit(
+    int64_t transaction_id,
+    storage::QuotaStatusCode status,
+    int64_t usage,
+    int64_t quota) {
+  // May have disconnected while quota check was pending.
+  if (!connection_->IsConnected())
+    return;
+
+  int64_t host_transaction_id =
+      dispatcher_host_->HostTransactionId(transaction_id);
+  // May have aborted while quota check was pending.
+  int64_t transaction_size;
+  if (!dispatcher_host_->GetTransactionSize(host_transaction_id,
+                                            &transaction_size))
+    return;
+
+  if (status == storage::kQuotaStatusOk && usage + transaction_size <= quota) {
+    connection_->database()->Commit(host_transaction_id);
+  } else {
+    connection_->database()->Abort(
+        host_transaction_id,
+        IndexedDBDatabaseError(blink::WebIDBDatabaseExceptionQuotaError));
+  }
+}
+
+}  // namespace content