Add histograms in Blink for Geolocation request timeouts.

third_party/WebKit/Source/modules/geolocation/GeoNotifier.cpp

 // Copyright 2014 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 "modules/geolocation/GeoNotifier.h"
 
 #include "modules/geolocation/Geolocation.h"
 #include "modules/geolocation/PositionError.h"
 #include "modules/geolocation/PositionOptions.h"
+#include "platform/Histogram.h"
 
 namespace blink {
 
 GeoNotifier::GeoNotifier(Geolocation* geolocation, PositionCallback* successCallback, PositionErrorCallback* errorCallback, const PositionOptions& options)
     : m_geolocation(geolocation)
     , m_successCallback(successCallback)
     , m_errorCallback(errorCallback)
     , m_options(options)
     , m_timer(this, &GeoNotifier::timerFired)
     , m_useCachedPosition(false)
 {
     ASSERT(m_geolocation);
     ASSERT(m_successCallback);
+
+    DEFINE_STATIC_LOCAL(CustomCountHistogram, timeoutHistogram, ("Geolocation.Timeout", 0, 1000 * 60 * 10 /* 10 minute max */, 20 /* buckets */));
+    timeoutHistogram.count(m_options.timeout());
 }
 
 DEFINE_TRACE(GeoNotifier)
 {
     visitor->trace(m_geolocation);
     visitor->trace(m_successCallback);
     visitor->trace(m_errorCallback);
     visitor->trace(m_fatalError);
 }
 
@@ skipping 54 matching lines @@
     if (m_useCachedPosition) {
         // Clear the cached position flag in case this is a watch request, which
         // will continue to run.
         m_useCachedPosition = false;
         m_geolocation->requestUsesCachedPosition(this);
         return;
     }
 
     if (m_errorCallback)
         m_errorCallback->handleEvent(PositionError::create(PositionError::TIMEOUT, "Timeout expired"));
+
+    DEFINE_STATIC_LOCAL(CustomCountHistogram, timeoutExpiredHistogram, ("Geolocation.TimeoutExpired", 0, 1000 * 60 * 10 /* 10 minute max */, 20 /* buckets */));
+    timeoutExpiredHistogram.count(m_options.timeout());
+
     m_geolocation->requestTimedOut(this);
 }
 
 } // namespace blink