First step of HTMLImports

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index b643c2e17e6c0be32d2c200b366688ee45d78d06..09ab44614d3db5532cf793eac671fe0e994543f0 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -40,6 +40,7 @@
 #include "core/dom/UserActionElementSet.h"
 #include "core/dom/ViewportArguments.h"
 #include "core/html/CollectionType.h"
+#include "core/html/HTMLImportsHost.h"
 #include "core/inspector/InspectorCounters.h"
 #include "core/page/FocusDirection.h"
 #include "core/page/PageVisibilityState.h"
@@ -200,7 +201,7 @@ enum DocumentClass {
 
 typedef unsigned char DocumentClassFlags;
 
-class Document : public ContainerNode, public TreeScope, public ScriptExecutionContext {
+class Document : public ContainerNode, public TreeScope, public HTMLImportsHost, public ScriptExecutionContext {
 public:
     static PassRefPtr<Document> create(Frame* frame, const KURL& url)
     {
@@ -429,6 +430,7 @@ public:
     void notifyRemovePendingSheetIfNeeded();
 
     bool haveStylesheetsLoaded() const;
+    bool haveStylesheetsAndImportsLoaded() const { return haveImportsLoaded() && haveStylesheetsLoaded(); }
 
     // This is a DOM function.
     StyleSheetList* styleSheets();
@@ -1061,6 +1063,7 @@ public:
     PassRefPtr<CustomElementConstructor> registerElement(WebCore::ScriptState*, const AtomicString& name, const Dictionary& options, ExceptionCode&);
     CustomElementRegistry* registry() const { return m_registry.get(); }
     CustomElementRegistry* ensureCustomElementRegistry();
+    HTMLImports* imports();
 
     void adjustFloatQuadsForScrollAndAbsoluteZoom(Vector<FloatQuad>&, RenderObject*);
     void adjustFloatRectForScrollAndAbsoluteZoom(FloatRect&, RenderObject*);
@@ -1152,6 +1155,13 @@ private:
 
     void createStyleResolver();
 
+    void executeScriptsWaitingForResourcesIfNeeded();
+
+    bool haveImportsLoaded() const;
+    // HTMLImportsHost
+    virtual void didLoadAllImports() OVERRIDE;
+    virtual SecurityContext* importsContext() OVERRIDE;
+
     void seamlessParentUpdatedStylesheets();
 
     PassRefPtr<NodeList> handleZeroPadding(const HitTestRequest&, HitTestResult&) const;
@@ -1410,6 +1420,7 @@ private:
     OwnPtr<TextAutosizer> m_textAutosizer;
 
     RefPtr<CustomElementRegistry> m_registry;
+    OwnPtr<HTMLImports> m_imports;
 
     bool m_scheduledTasksAreSuspended;