Migrate page_load_metrics out of components.

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 <memory>
-
-#include "base/macros.h"
-#include "components/page_load_metrics/common/page_load_timing.h"
-#include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.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,
-                          std::unique_ptr<base::Timer> timer,
-                          const PageLoadTiming& initial_timing);
-  ~PageTimingMetricsSender();
-
-  void DidObserveLoadingBehavior(blink::WebLoadingBehaviorFlag behavior);
-  void Send(const PageLoadTiming& timing);
-
- protected:
-  base::Timer* timer() const { return timer_.get(); }
-
- private:
-  void EnsureSendTimer(int delay);
-  void SendNow();
-
-  IPC::Sender* const ipc_sender_;
-  const int routing_id_;
-  std::unique_ptr<base::Timer> timer_;
-  PageLoadTiming last_timing_;
-
-  // The the sender keep track of metadata as it comes in, because the sender is
-  // scoped to a single committed load.
-  PageLoadMetadata metadata_;
-
-  DISALLOW_COPY_AND_ASSIGN(PageTimingMetricsSender);
-};
-
-}  // namespace page_load_metrics
-
-#endif  // COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_TIMING_METRICS_SENDER_H_