Added coordinates information to InputLatency

ui/events/latency_info.cc

Index: ui/events/latency_info.cc
diff --git a/ui/events/latency_info.cc b/ui/events/latency_info.cc
index 4e817d06432107f2f6a45861ab30b39fefad0b68..2b1af78379f7d3e5775521b80605b7c6dedbd088 100644
--- a/ui/events/latency_info.cc
+++ b/ui/events/latency_info.cc
@@ -13,6 +13,7 @@
 namespace {
 
 const size_t kMaxLatencyInfoNumber = 100;
+const size_t kMaxCoordinatesNumber = 12;
 
 const char* GetComponentName(ui::LatencyComponentType type) {
 #define CASE_TYPE(t) case ui::t:  return #t
@@ -117,6 +118,16 @@ scoped_refptr<base::debug::ConvertableToTraceFormat> AsTraceableData(
     record_data->Set(GetComponentName(it->first.first), component_info);
   }
   record_data->SetDouble("trace_id", latency.trace_id);
+
+  scoped_ptr<base::ListValue> coordinates(new base::ListValue());
+  for (size_t i = 0; i < latency.coordinates.size(); i++) {
+    scoped_ptr<base::DictionaryValue> coordinate_pair(
+        new base::DictionaryValue());
+    coordinate_pair->SetDouble("x", latency.coordinates[i].x());
+    coordinate_pair->SetDouble("y", latency.coordinates[i].y());
+    coordinates->Append(coordinate_pair.release());
+  }
+  record_data->Set("coordinates", coordinates.release());
   return LatencyInfoTracedValue::FromValue(record_data.PassAs<base::Value>());
 }
 
@@ -137,6 +148,14 @@ bool LatencyInfo::Verify(const std::vector<LatencyInfo>& latency_info,
                << latency_info.size() << " is too big.";
     return false;
   }
+  for (size_t i = 0; i < latency_info.size(); i++) {
+    if (latency_info[i].coordinates.size() > kMaxCoordinatesNumber) {
+      LOG(ERROR) << referring_msg << ", coordinates vector size "
+                 << latency_info[i].coordinates.size() << " is too big.";
+      return false;
+    }
+  }
+
   return true;
 }