Implement HTMLMediaElement::srcObject.

Source/core/html/MediaProvider.cpp

Index: Source/core/html/MediaProvider.cpp
diff --git a/Source/core/dom/custom/CustomElementAsyncImportMicrotaskQueue.cpp b/Source/core/html/MediaProvider.cpp
similarity index 50%
copy from Source/core/dom/custom/CustomElementAsyncImportMicrotaskQueue.cpp
copy to Source/core/html/MediaProvider.cpp
index d5e946c4b0c7c7c94903f766a0981b4648e30b69..98c706acfe9df5542d2405ce43c6d0d9ddd497c8 100644
--- a/Source/core/dom/custom/CustomElementAsyncImportMicrotaskQueue.cpp
+++ b/Source/core/html/MediaProvider.cpp
@@ -29,27 +29,60 @@
  */
 
 #include "config.h"
-#include "core/dom/custom/CustomElementAsyncImportMicrotaskQueue.h"
+#include "core/html/MediaProvider.h"
 
-#include "core/dom/custom/CustomElementMicrotaskImportStep.h"
+#include "wtf/MainThread.h"
 
 namespace blink {
 
-void CustomElementAsyncImportMicrotaskQueue::enqueue(PassOwnPtrWillBeRawPtr<CustomElementMicrotaskStep> step)
+class MediaProviderConverterContainer {
+public:
+    static MediaProviderConverterContainer& container();
+
+    void registerMediaProviderConverter(RawPtr<MediaProviderConverter>);
+    virtual MediaProvider* convert(const ScriptValue&);
+
+private:
+    Vector<RawPtr<MediaProviderConverter> > m_converters;
+};
+
+MediaProviderConverterContainer& MediaProviderConverterContainer::container()
 {
-    m_queue.append(step);
+    ASSERT(isMainThread());
+    DEFINE_STATIC_LOCAL(MediaProviderConverterContainer, instance, ());
+    return instance;
 }
 
-void CustomElementAsyncImportMicrotaskQueue::doDispatch()
+void MediaProviderConverterContainer::registerMediaProviderConverter(RawPtr<MediaProviderConverter> converter)
 {
-    WillBeHeapVector<OwnPtrWillBeMember<CustomElementMicrotaskStep> > remaining;
+    if (m_converters.find(converter) == kNotFound)
+        m_converters.append(converter);
+}
 
-    for (unsigned i = 0; i < m_queue.size(); ++i) {
-        if (CustomElementMicrotaskStep::Processing == m_queue[i]->process())
-            remaining.append(m_queue[i].release());
+MediaProvider* MediaProviderConverterContainer::convert(const ScriptValue& value)
+{
+    for (Vector<RawPtr<MediaProviderConverter> >::iterator it =  m_converters.begin(); it != m_converters.end(); ++it) {
+        MediaProvider* provider = (*it)->getMediaProvider(value);
+        if (provider)
+            return provider;
     }
+    return nullptr;
+}
 
-    m_queue.swap(remaining);
+MediaProviderConverter::MediaProviderConverter()
+{
+    MediaProviderConverterContainer::container().registerMediaProviderConverter(this);
+}
+
+MediaProvider* MediaProviderConverter::convert(const ScriptValue& value)
+{
+    return MediaProviderConverterContainer::container().convert(value);
+}
+
+MediaProvider::MediaProvider(RawPtr<MediaProviderConverter> converter)
+{
+    MediaProviderConverterContainer& container = MediaProviderConverterContainer::container();
+    container.registerMediaProviderConverter(converter);
 }
 
 } // namespace blink