Use WTF::TimeTicks to represent timestamp in Platform/Core event types

third_party/WebKit/Source/wtf/Time.h

Index: third_party/WebKit/Source/wtf/Time.h
diff --git a/third_party/WebKit/Source/wtf/Time.h b/third_party/WebKit/Source/wtf/Time.h
index 3bc5ae8c821e69001416ab360655be998ccc36fd..e55ebf2375eb7039c29824415ea938a5d7e59c5a 100644
--- a/third_party/WebKit/Source/wtf/Time.h
+++ b/third_party/WebKit/Source/wtf/Time.h
@@ -43,6 +43,17 @@ class TimeWrapper {
     return m_value.ToInternalValue();
   }
 
+  // Only use this conversion when interfacing with legacy code that represents
+  // time in double. Converting to double can lead to losing information for
+  // large time values.
+  double InSeconds() const {
+    return (m_value - WrappedTimeType()).InSecondsF();
+  }
+
+  static TimeWrapper FromSeconds(double seconds) {
+    return WrappedTimeType() + TimeDelta::FromSecondsD(seconds);
+  }
+
   TimeWrapper& operator=(TimeWrapper other) {
     m_value = other.m_value;
     return *this;