Factor management of metrics updates into its own class.

chrome/renderer/page_load_metrics/page_timing_metrics_sender.cc

 // Copyright 2015 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 "chrome/renderer/page_load_metrics/page_timing_metrics_sender.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
+#include "chrome/common/page_load_metrics/page_load_metrics_constants.h"
 #include "chrome/renderer/page_load_metrics/page_timing_sender.h"
 
 namespace page_load_metrics {
 
 namespace {
 const int kInitialTimerDelayMillis = 50;
-const int kTimerDelayMillis = 1000;
 }  // namespace
 
 PageTimingMetricsSender::PageTimingMetricsSender(
     std::unique_ptr<PageTimingSender> sender,
     std::unique_ptr<base::Timer> timer,
     mojom::PageLoadTimingPtr initial_timing)
     : sender_(std::move(sender)),
       timer_(std::move(timer)),
       last_timing_(std::move(initial_timing)),
       metadata_(mojom::PageLoadMetadata::New()) {
@@ skipping 33 matching lines @@
 
   last_timing_ = std::move(timing);
   EnsureSendTimer();
 }
 
 void PageTimingMetricsSender::EnsureSendTimer() {
   if (!timer_->IsRunning()) {
     // Send the first IPC eagerly to make sure the receiving side knows we're
     // sending metrics as soon as possible.
     int delay_ms =
-        have_sent_ipc_ ? kTimerDelayMillis : kInitialTimerDelayMillis;
+        have_sent_ipc_ ? kBufferTimerDelayMillis : kInitialTimerDelayMillis;
     timer_->Start(
         FROM_HERE, base::TimeDelta::FromMilliseconds(delay_ms),
         base::Bind(&PageTimingMetricsSender::SendNow, base::Unretained(this)));
   }
 }
 
 void PageTimingMetricsSender::SendNow() {
   have_sent_ipc_ = true;
   sender_->SendTiming(last_timing_, metadata_);
 }
 
 }  // namespace page_load_metrics