Migrate page_load_metrics out of components.

components/page_load_metrics/renderer/metrics_render_frame_observer.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_LOAD_METRICS_RENDER_FRAME_OBSERVER_H_
-#define COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_LOAD_METRICS_RENDER_FRAME_OBSERVER_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "components/page_load_metrics/common/page_load_timing.h"
-#include "content/public/renderer/render_frame_observer.h"
-#include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
-
-namespace base {
-class Timer;
-}  // namespace base
-
-namespace page_load_metrics {
-
-class PageTimingMetricsSender;
-
-// MetricsRenderFrameObserver observes RenderFrame notifications, and
-// sends page load timing information to the browser process over IPC.
-class MetricsRenderFrameObserver : public content::RenderFrameObserver {
- public:
-  explicit MetricsRenderFrameObserver(content::RenderFrame* render_frame);
-  ~MetricsRenderFrameObserver() override;
-
-  // RenderFrameObserver implementation
-  void DidChangePerformanceTiming() override;
-  void DidObserveLoadingBehavior(
-      blink::WebLoadingBehaviorFlag behavior) override;
-  void DidCommitProvisionalLoad(bool is_new_navigation,
-                                bool is_same_page_navigation) override;
-  void OnDestruct() override;
-
- private:
-  // Will be null when we're not actively sending metrics.
-  std::unique_ptr<PageTimingMetricsSender> page_timing_metrics_sender_;
-
-  void SendMetrics();
-  virtual bool ShouldSendMetrics() const;
-  virtual PageLoadTiming GetTiming() const;
-  virtual std::unique_ptr<base::Timer> CreateTimer() const;
-  virtual bool HasNoRenderFrame() const;
-
-  DISALLOW_COPY_AND_ASSIGN(MetricsRenderFrameObserver);
-};
-
-}  // namespace page_load_metrics
-
-#endif  // COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_LOAD_METRICS_RENDER_FRAME_OBSERVER_H_