Support performance.now() in workers.

Source/modules/performance/WorkerPerformance.h

 /*
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@@ skipping 10 matching lines @@
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  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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-#ifndef Composition_h
-#define Composition_h
+#ifndef WorkerPerformance_h
+#define WorkerPerformance_h
 
-#include "bindings/v8/ScriptWrappable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
-class Node;
-class Range;
+class WorkerContext;
 
-class Composition : public RefCounted<Composition>, public ScriptWrappable {
+class WorkerPerformance : public RefCounted<WorkerPerformance> {
 public:
-    static PassRefPtr<Composition> create(Node*, Range*);
-    ~Composition();
+    static PassRefPtr<WorkerPerformance> create(WorkerContext* context) { return adoptRef(new WorkerPerformance(context)); }
+    ~WorkerPerformance();
 
-    Node* text() const { return m_text.get(); }
-    Range* caret() const { return m_caret.get(); }
+    using RefCounted<WorkerPerformance>::ref;
+    using RefCounted<WorkerPerformance>::deref;

[abarth-chromium, 2013/06/12 23:11:41]

These aren't needed.

[James Simonsen, 2013/06/13 00:01:36]

Done. Thanks.

+
+    double now() const;
 
 private:
-    Composition(Node*, Range*);
+    explicit WorkerPerformance(WorkerContext*);
 
-    RefPtr<Node> m_text;
-    RefPtr<Range> m_caret;
+    WorkerContext* m_context;

[abarth-chromium, 2013/06/12 23:11:41]

Rather than holding a raw m_context pointer, this object should subclass
ContextDestructionObserver.  That way it won't have a pointer to a context that
has been freed.

[James Simonsen, 2013/06/13 00:01:36]

Done.

 };
 
-} // namespace WebCore
+}
 
-#endif // Composition_h
+#endif // WorkerPerformance_h