PageLoadMetrics renderer and browser implementation.

components/page_load_metrics/renderer/page_timing_metrics_sender.h

+// 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.
+
+#ifndef COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_TIMING_METRICS_SENDER_H_
+#define COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_TIMING_METRICS_SENDER_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/page_load_metrics/common/page_load_timing.h"
+
+namespace base {
+class Timer;
+}  // namespace base
+
+namespace IPC {
+class Sender;
+}  // namespace IPC
+
+namespace page_load_metrics {
+
+// PageTimingMetricsSender is responsible for sending page load timing metrics
+// over IPC. PageTimingMetricsSender may coalesce sent IPCs in order to
+// minimize IPC contention.
+class PageTimingMetricsSender {
+ public:
+  PageTimingMetricsSender(IPC::Sender* ipc_sender,
+                          int routing_id,
+                          scoped_ptr<base::Timer> timer);
+  ~PageTimingMetricsSender();
+
+  void Send(const PageLoadTiming& timing);
+
+ protected:
+  base::Timer* timer() const { return timer_.get(); }
+
+ private:
+  void SendNow();
+
+  IPC::Sender* const ipc_sender_;
+  const int routing_id_;
+  scoped_ptr<base::Timer> timer_;
+  PageLoadTiming last_timing_;
+
+  DISALLOW_COPY_AND_ASSIGN(PageTimingMetricsSender);
+};
+
+}  // namespace page_load_metrics
+
+#endif  // COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_TIMING_METRICS_SENDER_H_