We use UMA to track event latency both as a group of all events

ui/base/events/event.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/events/event.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #endif
 
@@ skipping 166 matching lines @@
       phase_(EP_PREDISPATCH),
       result_(ER_UNHANDLED) {
   base::TimeDelta delta = ui::EventTimeForNow() - time_stamp_;
   if (type_ < ET_LAST)
     name_ = EventTypeName(type_);
   UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.Browser",
                               delta.InMicroseconds(), 0, 1000000, 100);
   std::string name_for_event =
       base::StringPrintf("Event.Latency.Browser.%s", name_.c_str());
   base::HistogramBase* counter_for_type =
-      base::Histogram::FactoryTimeGet(
+      base::Histogram::FactoryGet(
           name_for_event,
-          base::TimeDelta::FromMilliseconds(0),
-          base::TimeDelta::FromMilliseconds(1000000),
+          0,
+          1000000,
           100,
           base::HistogramBase::kUmaTargetedHistogramFlag);
-  counter_for_type->AddTime(delta);
+  counter_for_type->Add(delta.InMicroseconds());
   InitWithNativeEvent(native_event);
 }
 
 Event::Event(const Event& copy)
     : native_event_(::CopyNativeEvent(copy.native_event_)),
       type_(copy.type_),
       time_stamp_(copy.time_stamp_),
       flags_(copy.flags_),
       dispatch_to_hidden_targets_(false),
       delete_native_event_(false),
@@ skipping 500 matching lines @@
 int GestureEvent::GetLowestTouchId() const {
   if (touch_ids_bitfield_ == 0)
     return -1;
   int i = -1;
   // Find the index of the least significant 1 bit
   while (!(1 << ++i & touch_ids_bitfield_));
   return i;
 }
 
 }  // namespace ui