Add the SharedWorker.workerStart property for high resolution timers.

Source/modules/performance/SharedWorkerPerformance.h

 /*
- * 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
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of Opera Software ASA nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY 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.
  */
 
-#ifndef LengthPoint_h
-#define LengthPoint_h
+#ifndef SharedWorkerPerformance_h
+#define SharedWorkerPerformance_h
 
-#include "platform/Length.h"
+#include "platform/Supplementable.h"
 
 namespace WebCore {
 
-struct LengthPoint {
+class ExecutionContext;
+class SharedWorker;
+
+class SharedWorkerPerformance : public Supplement<SharedWorker> {
 public:
-    LengthPoint()
-    {
-    }
+    virtual ~SharedWorkerPerformance();
+    static SharedWorkerPerformance* from(SharedWorker*);
 
-    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; }
-
-    void setX(Length x) { m_x = x; }
-    Length x() const { return m_x; }
-
-    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