chrome/renderer/page_load_histograms.h

   1 // Copyright (c) 2012 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 CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_
   6 #define CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_
   7
   8 #include "base/basictypes.h"
   9 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
  10 #include "content/public/renderer/render_view_observer.h"
  11
  12 namespace content {
  13 class DocumentState;
  14 }
  15
  16 class PageLoadHistograms : public content::RenderViewObserver {
  17  public:
  18   explicit PageLoadHistograms(content::RenderView* render_view);
  19
  20  private:
  21   // RenderViewObserver implementation.
  22   void FrameWillClose(blink::WebFrame* frame) override;
  23   void ClosePage() override;
  24
  25   // Dump all page load histograms appropriate for the given frame.
  26   //
  27   // This method will only dump once-per-instance, so it is safe to call
  28   // multiple times.
  29   //
  30   // The time points we keep are
  31   //    request: time document was requested by user
  32   //    start: time load of document started
  33   //    commit: time load of document started
  34   //    finish_document: main document loaded, before onload()
  35   //    finish_all_loads: after onload() and all resources are loaded
  36   //    first_paint: first paint performed
  37   //    first_paint_after_load: first paint performed after load is finished
  38   //    begin: request if it was user requested, start otherwise
  39   //
  40   // It's possible for the request time not to be set, if a client
  41   // redirect had been done (the user never requested the page)
  42   // Also, it's possible to load a page without ever laying it out
  43   // so first_paint and first_paint_after_load can be 0.
  44   void Dump(blink::WebFrame* frame);
  45
  46   void LogPageLoadTime(const content::DocumentState* load_times,
  47                        const blink::WebDataSource* ds) const;
  48
  49   data_reduction_proxy::DataReductionProxyParams data_reduction_proxy_params_;
  50
  51   DISALLOW_COPY_AND_ASSIGN(PageLoadHistograms);
  52 };
  53
  54 #endif  // CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_