Add constructors to WebInputEvents and setters so we can work at cleaning up these public structs.

content/common/input/event_with_latency_info.h

Index: content/common/input/event_with_latency_info.h
diff --git a/content/common/input/event_with_latency_info.h b/content/common/input/event_with_latency_info.h
index 750b15d23390023da338ae7ec872129a8e5b9f7e..789c88831d6fb15b531e60737975a071a18b4f0f 100644
--- a/content/common/input/event_with_latency_info.h
+++ b/content/common/input/event_with_latency_info.h
@@ -48,6 +48,12 @@ class EventWithLatencyInfo {
   EventWithLatencyInfo(const T& e, const ui::LatencyInfo& l)
       : event(e), latency(l) {}
 
+  EventWithLatencyInfo(blink::WebInputEvent::Type type,
+                       int modifiers,
+                       double timeStampSeconds,
+                       const ui::LatencyInfo& l)
+      : event(type, modifiers, timeStampSeconds), latency(l) {}
+
   EventWithLatencyInfo() {}
 
   bool CanCoalesceWith(const EventWithLatencyInfo& other)
@@ -70,7 +76,7 @@ class EventWithLatencyInfo {
     // should always be preserved.
     const double time_stamp_seconds = other.event.timeStampSeconds;
     ui::Coalesce(other.event, &event);
-    event.timeStampSeconds = time_stamp_seconds;
+    event.setTimeStampSeconds(time_stamp_seconds);
 
     // When coalescing two input events, we keep the oldest LatencyInfo
     // for Telemetry latency tests, since it will represent the longest