[IndexedDB] Add Observer Tests

third_party/WebKit/Source/modules/indexeddb/IDBObserver.cpp

 // 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 "modules/indexeddb/IDBObserver.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/modules/v8/ToV8ForModules.h"
 #include "bindings/modules/v8/V8BindingForModules.h"
 #include "core/dom/ExceptionCode.h"
@@ skipping 11 matching lines @@
 {
     return new IDBObserver(callback, options);
 }
 
 IDBObserver::IDBObserver(IDBObserverCallback& callback, const IDBObserverInit& options)
     : m_callback(&callback)
     , m_transaction(options.transaction())
     , m_values(options.values())
     , m_noRecords(options.noRecords())
 {
-    // TODO(palakj): Throw an exception if unknown operation type.
     DCHECK_EQ(m_operationTypes.size(), static_cast<size_t>(WebIDBOperationTypeCount));
     m_operationTypes.reset();
     m_operationTypes[WebIDBAdd] = options.operationTypes().contains(IndexedDBNames::add);
     m_operationTypes[WebIDBPut] = options.operationTypes().contains(IndexedDBNames::put);
     m_operationTypes[WebIDBDelete] = options.operationTypes().contains(IndexedDBNames::kDelete);
     m_operationTypes[WebIDBClear] = options.operationTypes().contains(IndexedDBNames::clear);
 }
 
 IDBObserver::~IDBObserver() {}
 
@@ skipping 49 matching lines @@
     m_callback->handleChanges(*IDBObserverChanges::create(it->value, observations, observationIndex), *this);
 }
 
 DEFINE_TRACE(IDBObserver)
 {
     visitor->trace(m_callback);
     visitor->trace(m_observerIds);
 }
 
 } // namespace blink