Consolidate WebInputEvent coalescing logic

content/port/browser/event_with_latency_info.h

Index: content/port/browser/event_with_latency_info.h
diff --git a/content/port/browser/event_with_latency_info.h b/content/port/browser/event_with_latency_info.h
index a39ae52076d08fa6a894d84c0625a63303d6a4d0..28c8ea2d59293eb3b4584ef5d7fd0bb358fbb941 100644
--- a/content/port/browser/event_with_latency_info.h
+++ b/content/port/browser/event_with_latency_info.h
@@ -7,6 +7,8 @@
 
 #include "ui/events/latency_info.h"
 
+#include "content/common/input/web_input_event_traits.h"
+
 namespace WebKit {
 class WebGestureEvent;
 class WebMouseEvent;
@@ -26,6 +28,14 @@ class EventWithLatencyInfo {
       : event(e), latency(l) {}
 
   EventWithLatencyInfo() {}
+
+  bool TryCoalesceWith(const EventWithLatencyInfo& other) {
+    if (WebInputEventTraits::TryCoalesce(other.event, &event)) {
+      latency.MergeWith(other.latency);
+      return true;
+    }
+    return false;
+  }
 };
 
 typedef EventWithLatencyInfo<WebKit::WebGestureEvent>