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

third_party/WebKit/Source/core/events/KeyboardEvent.cpp

Index: third_party/WebKit/Source/core/events/KeyboardEvent.cpp
diff --git a/third_party/WebKit/Source/core/events/KeyboardEvent.cpp b/third_party/WebKit/Source/core/events/KeyboardEvent.cpp
index ed4874279a25fee3e14338e647b6fb64e540d61b..1cd5849840dad28d879040e01b78502043ae1d7d 100644
--- a/third_party/WebKit/Source/core/events/KeyboardEvent.cpp
+++ b/third_party/WebKit/Source/core/events/KeyboardEvent.cpp
@@ -63,6 +63,10 @@ KeyboardEvent::KeyLocationCode keyLocationCode(const WebInputEvent& key) {
   return KeyboardEvent::kDomKeyLocationStandard;
 }
 
+TimeTicks timeStampSecondsToTimeTicks(double seconds) {
+  return TimeTicks() + TimeDelta::FromSecondsD(seconds);
+}
+
 bool hasCurrentComposition(LocalDOMWindow* domWindow) {
   if (!domWindow)
     return false;
@@ -95,7 +99,7 @@ KeyboardEvent::KeyboardEvent(const WebKeyboardEvent& key,
           domWindow,
           0,
           static_cast<PlatformEvent::Modifiers>(key.modifiers),
-          key.timeStampSeconds,
+          timeStampSecondsToTimeTicks(key.timeStampSeconds),
           InputDeviceCapabilities::doesntFireTouchEventsSourceCapabilities()),
       m_keyEvent(makeUnique<WebKeyboardEvent>(key)),
       // TODO(crbug.com/482880): Fix this initialization to lazy initialization.