[IndexedDB] Propogating changes to observers : Renderer

third_party/WebKit/Source/bindings/modules/v8/V8IDBObserverCallback.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 "bindings/modules/v8/V8IDBObserverCallback.h"
 
 #include "bindings/core/v8/ScriptController.h"
+#include "bindings/core/v8/ToV8.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8PrivateProperty.h"
 #include "bindings/modules/v8/V8IDBObserver.h"
+#include "bindings/modules/v8/V8IDBObserverChanges.h"
+#include "wtf/Assertions.h"
 
 namespace blink {
 
 V8IDBObserverCallback::V8IDBObserverCallback(v8::Local<v8::Function> callback, v8::Local<v8::Object> owner, ScriptState* scriptState)
     : ActiveDOMCallback(scriptState->getExecutionContext())
     , m_callback(scriptState->isolate(), callback)
     , m_scriptState(scriptState)
 {
     V8PrivateProperty::getIDBObserverCallback(scriptState->isolate()).set(scriptState->context(), owner, callback);
     m_callback.setPhantom();
 }
 
 V8IDBObserverCallback::~V8IDBObserverCallback()
 {
 }
 
+void V8IDBObserverCallback::handleEvent(IDBObserverChanges& changes, IDBObserver& observer)
+{
+    if (!canInvokeCallback())
+        return;
+
+    if (!m_scriptState->contextIsValid())
+        return;
+    ScriptState::Scope scope(m_scriptState.get());
+
+    if (m_callback.isEmpty())
+        return;
+    v8::Local<v8::Value> observerHandle = toV8(&observer, m_scriptState->context()->Global(), m_scriptState->isolate());
+    if (observerHandle.IsEmpty()) {
+        if (!isScriptControllerTerminating())
+            CRASH();
+        return;
+    }
+
+    if (!observerHandle->IsObject())
+        return;
+
+    v8::Local<v8::Object> thisObject = v8::Local<v8::Object>::Cast(observerHandle);
+    v8::Local<v8::Value> changesHandle = toV8(&changes, m_scriptState->context()->Global(), m_scriptState->isolate());
+    if (changesHandle.IsEmpty()) {
+        return;
+    }
+    v8::Local<v8::Value> argv[] = { changesHandle };
+
+    v8::TryCatch exceptionCatcher(m_scriptState->isolate());
+    exceptionCatcher.SetVerbose(true);
+    V8ScriptRunner::callFunction(m_callback.newLocal(m_scriptState->isolate()), m_scriptState->getExecutionContext(), thisObject, 1, argv, m_scriptState->isolate());
+}
+
 DEFINE_TRACE(V8IDBObserverCallback)
 {
     IDBObserverCallback::trace(visitor);
     ActiveDOMCallback::trace(visitor);
 }
 
 } // namespace blink