third_party/WebKit/Source/core/timing/SharedWorkerPerformance.cpp

/*
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#include "core/timing/SharedWorkerPerformance.h"

#include "core/dom/Document.h"
#include "core/dom/ExecutionContext.h"
#include "core/loader/DocumentLoadTiming.h"
#include "core/loader/DocumentLoader.h"
#include "core/workers/SharedWorker.h"

namespace blink {

SharedWorkerPerformance::SharedWorkerPerformance()
    : m_timeOrigin(monotonicallyIncreasingTime()) {}

const char* SharedWorkerPerformance::supplementName() {
  return "SharedWorkerPerformance";
}

SharedWorkerPerformance& SharedWorkerPerformance::from(
    SharedWorker& sharedWorker) {
  SharedWorkerPerformance* supplement = static_cast<SharedWorkerPerformance*>(
      Supplement<SharedWorker>::from(sharedWorker, supplementName()));
  if (!supplement) {
    supplement = new SharedWorkerPerformance();
    provideTo(sharedWorker, supplementName(), supplement);
  }
  return *supplement;
}

double SharedWorkerPerformance::workerStart(ExecutionContext* context,
                                            SharedWorker& sharedWorker) {
  return SharedWorkerPerformance::from(sharedWorker)
      .getWorkerStart(context, sharedWorker);
}

double SharedWorkerPerformance::getWorkerStart(ExecutionContext* context,
                                               SharedWorker&) const {
  ASSERT(context);
  ASSERT(context->isDocument());
  Document* document = toDocument(context);
  if (!document->loader())
    return 0;

  double navigationStart = document->loader()->timing().navigationStart();
  return m_timeOrigin - navigationStart;
}

}  // namespace blink