[HTML Imports] Implement "load" and "error" events.

Source/core/html/HTMLImportLoader.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/HTMLImportLoader.h"
 
 #include "core/dom/Document.h"
 #include "core/html/HTMLDocument.h"
+#include "core/html/HTMLImportLoaderClient.h"
 #include "core/loader/DocumentWriter.h"
 #include "core/loader/cache/ResourceFetcher.h"
 #include "core/page/ContentSecurityPolicyResponseHeaders.h"
 
 namespace WebCore {
 
 HTMLImportLoader::HTMLImportLoader(HTMLImport* parent, const KURL& url, const ResourcePtr<CachedRawResource>& resource)
     : m_parent(parent)
     , m_state(StateLoading)
     , m_resource(resource)
@@ skipping 32 matching lines @@
     if (m_state == state)
         return;
 
     m_state = state;
 
     if (m_state == StateReady || m_state == StateError || m_state == StateWritten) {
         if (RefPtr<DocumentWriter> writer = m_writer.release())
             writer->end();
     }
 
-    if (m_state == StateReady || m_state == StateError)
-        dispose();
+    // Since DocumentWriter::end() let setState() reenter, we shouldn't refer to m_state here.
+    if (state == StateReady || state == StateError)
+        didFinish();
 }
 
-void HTMLImportLoader::dispose()
+void HTMLImportLoader::didFinish()
 {
+    for (size_t i = 0; i < m_clients.size(); ++i)
+        m_clients[i]->didFinish();
+
     if (m_resource) {
         m_resource->removeClient(this);
         m_resource = 0;
     }
 
     ASSERT(!document() || !document()->parsing());
     root()->importWasDisposed();
 }
 
 HTMLImportLoader::State HTMLImportLoader::startWritingAndParsing(const ResourceResponse& response)
@@ skipping 28 matching lines @@
     return StateReady;
 }
 
 Document* HTMLImportLoader::importedDocument() const
 {
     if (m_state == StateError)
         return 0;
     return m_importedDocument.get();
 }
 
+void HTMLImportLoader::addClient(HTMLImportLoaderClient* client)
+{
+    ASSERT(notFound == m_clients.find(client));
+    m_clients.append(client);
+    if (isDone())
+        client->didFinish();
+}
+
+void HTMLImportLoader::removeClient(HTMLImportLoaderClient* client)
+{
+    ASSERT(notFound != m_clients.find(client));
+    m_clients.remove(m_clients.find(client));
+}
+
 void HTMLImportLoader::importDestroyed()
 {
     m_parent = 0;
     if (RefPtr<Document> document = m_importedDocument.release())
         document->setImport(0);
 }
 
 HTMLImportRoot* HTMLImportLoader::root()
 {
     return m_parent ? m_parent->root() : 0;
@@ skipping 22 matching lines @@
 }
 
 bool HTMLImportLoader::isProcessing() const
 {
     if (!m_importedDocument)
         return !isDone();
     return m_importedDocument->parsing();
 }
 
 } // namespace WebCore