PageLoadMetrics renderer and browser implementation.

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 "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/page_load_metrics/common/page_load_timing.h"
+#include "content/public/renderer/render_frame_observer.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 DidCommitProvisionalLoad(bool is_new_navigation,
+                                bool is_same_page_navigation) override;
+
+ private:
+  // Will be null when we're not actively sending metrics.
+  scoped_ptr<PageTimingMetricsSender> page_timing_metrics_sender_;
+
+  void SendMetrics();
+  virtual bool ShouldSendMetrics() const;
+  virtual PageLoadTiming GetTiming() const;
+  virtual scoped_ptr<base::Timer> CreateTimer() const;
+
+  DISALLOW_COPY_AND_ASSIGN(MetricsRenderFrameObserver);
+};
+
+}  // namespace page_load_metrics
+
+#endif  // COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_LOAD_METRICS_RENDER_FRAME_OBSERVER_H_