Add the SharedWorker.workerStart property for high resolution timers.

Source/modules/performance/SharedWorkerPerformance.h

Index: Source/modules/performance/SharedWorkerPerformance.h
diff --git a/Source/platform/LengthPoint.h b/Source/modules/performance/SharedWorkerPerformance.h
similarity index 70%
copy from Source/platform/LengthPoint.h
copy to Source/modules/performance/SharedWorkerPerformance.h
index 75497a1dcc3447a9f6d0598f6e67c4ef7eb9cc6d..b7afd473897d1a654859e505fdfc2a675d33885f 100644
--- a/Source/platform/LengthPoint.h
+++ b/Source/modules/performance/SharedWorkerPerformance.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, Opera Software ASA. All rights reserved.
+ * Copyright (c) 2014, Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -27,39 +27,31 @@
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef LengthPoint_h
-#define LengthPoint_h
+#ifndef SharedWorkerPerformance_h
+#define SharedWorkerPerformance_h
 
-#include "platform/Length.h"
+#include "platform/Supplementable.h"
 
 namespace WebCore {
 
-struct LengthPoint {
-public:
-    LengthPoint()
-    {
-    }
-
-    LengthPoint(Length x, Length y)
-        : m_x(x)
-        , m_y(y)
-    {
-    }
-
-    bool operator==(const LengthPoint& o) const { return m_x == o.m_x && m_y == o.m_y; }
-    bool operator!=(const LengthPoint& o) const { return m_x != o.m_x || m_y != o.m_y; }
+class ExecutionContext;
+class SharedWorker;
 
-    void setX(Length x) { m_x = x; }
-    Length x() const { return m_x; }
+class SharedWorkerPerformance : public Supplement<SharedWorker> {
+public:
+    virtual ~SharedWorkerPerformance();
+    static SharedWorkerPerformance* from(SharedWorker*);
 
-    void setY(Length y) { m_y = y; }
-    Length y() const { return m_y; }
+    static double workerStart(ExecutionContext*, SharedWorker*);
+    double getWorkerStart(ExecutionContext*, SharedWorker*) const;
 
 private:
-    Length m_x;
-    Length m_y;
+    explicit SharedWorkerPerformance();
+    static const char* supplementName();
+
+    double m_timeOrigin;
 };
 
 } // namespace WebCore
 
-#endif // LengthPoint_h
+#endif // SharedWorkerPerformance_h