Remove duplicate domHighResTimestamp conversion in NavigationTiming

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

Index: third_party/WebKit/Source/core/timing/PerformanceBase.cpp
diff --git a/third_party/WebKit/Source/core/timing/PerformanceBase.cpp b/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
index 660507eee11d03eae3d5bff86da2a268791a26b1..995c7eb671c0e218f340f43dbc78430d06d43f51 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
+++ b/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
@@ -556,16 +556,23 @@ double PerformanceBase::clampTimeResolution(double timeSeconds) {
 }
 
 DOMHighResTimeStamp PerformanceBase::monotonicTimeToDOMHighResTimeStamp(
-    double monotonicTime) const {
+    double timeOrigin,
+    double monotonicTime) {
   // Avoid exposing raw platform timestamps.
-  if (m_timeOrigin == 0.0)
+  if (!monotonicTime || !timeOrigin)
     return 0.0;
 
-  double timeInSeconds = monotonicTime - m_timeOrigin;
+  double timeInSeconds = monotonicTime - timeOrigin;
+  DCHECK_GE(timeInSeconds, 0);
   return convertSecondsToDOMHighResTimeStamp(
       clampTimeResolution(timeInSeconds));
 }
 
+DOMHighResTimeStamp PerformanceBase::monotonicTimeToDOMHighResTimeStamp(
+    double monotonicTime) const {
+  return monotonicTimeToDOMHighResTimeStamp(m_timeOrigin, monotonicTime);
+}
+
 DOMHighResTimeStamp PerformanceBase::now() const {
   return monotonicTimeToDOMHighResTimeStamp(monotonicallyIncreasingTime());
 }