Remove gpu side LatencyInfo merging

ui/events/latency_info.h

Index: ui/events/latency_info.h
diff --git a/ui/events/latency_info.h b/ui/events/latency_info.h
index 3e50cc4f80c127b917513b65a07ebf7d29ab5571..96f76fbb890ffe179fb61e3a5d37249e5693a47b 100644
--- a/ui/events/latency_info.h
+++ b/ui/events/latency_info.h
@@ -7,6 +7,7 @@
 
 #include <map>
 #include <utility>
+#include <vector>
 
 #include "base/basictypes.h"
 #include "base/time/time.h"
@@ -87,6 +88,16 @@ struct EVENTS_BASE_EXPORT LatencyInfo {
 
   ~LatencyInfo();
 
+  // Returns true if the vector |latency_info| is valid. Returns false
+  // if it is not valid and log the |referring_msg|.
+  // This function is mainly used to check the latency_info vector that
+  // is passed between processes using IPC message has reasonable size
+  // so that we are confident the IPC message is not corrupted/compromised.
+  // This check will go away once the IPC system has better built-in scheme
+  // for corruption/compromise detection.
+  static bool Verify(const std::vector<LatencyInfo>& latency_info,
+                     const char* referring_msg);
+
   // Merges the contents of another LatencyInfo into this one.
   void MergeWith(const LatencyInfo& other);