components/page_load_metrics/renderer/metrics_render_frame_observer.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_LOAD_METRICS_RENDER_FRAME_OBSERVER_H_
   6 #define COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_LOAD_METRICS_RENDER_FRAME_OBSERVER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "components/page_load_metrics/common/page_load_timing.h"
  11 #include "content/public/renderer/render_frame_observer.h"
  12
  13 namespace base {
  14 class Timer;
  15 }  // namespace base
  16
  17 namespace page_load_metrics {
  18
  19 class PageTimingMetricsSender;
  20
  21 // MetricsRenderFrameObserver observes RenderFrame notifications, and
  22 // sends page load timing information to the browser process over IPC.
  23 class MetricsRenderFrameObserver : public content::RenderFrameObserver {
  24  public:
  25   explicit MetricsRenderFrameObserver(content::RenderFrame* render_frame);
  26   ~MetricsRenderFrameObserver() override;
  27
  28   // RenderFrameObserver implementation
  29   void DidChangePerformanceTiming() override;
  30   void DidCommitProvisionalLoad(bool is_new_navigation,
  31                                 bool is_same_page_navigation) override;
  32
  33  private:
  34   // Will be null when we're not actively sending metrics.
  35   scoped_ptr<PageTimingMetricsSender> page_timing_metrics_sender_;
  36
  37   void SendMetrics();
  38   virtual bool ShouldSendMetrics() const;
  39   virtual PageLoadTiming GetTiming() const;
  40   virtual scoped_ptr<base::Timer> CreateTimer() const;
  41
  42   DISALLOW_COPY_AND_ASSIGN(MetricsRenderFrameObserver);
  43 };
  44
  45 }  // namespace page_load_metrics
  46
  47 #endif  // COMPONENTS_PAGE_LOAD_METRICS_RENDERER_PAGE_LOAD_METRICS_RENDER_FRAME_OBSERVER_H_