chrome/renderer/page_load_histograms.h

   1 // Copyright (c) 2011 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 "content/public/renderer/render_view_observer.h"
  10
  11 namespace content {
  12 class DocumentState;
  13 }
  14
  15 class RendererHistogramSnapshots;
  16
  17 class PageLoadHistograms : public content::RenderViewObserver {
  18  public:
  19   PageLoadHistograms(content::RenderView* render_view,
  20                      RendererHistogramSnapshots* histogram_snapshots);
  21
  22  private:
  23   // RenderViewObserver implementation.
  24   virtual void FrameWillClose(WebKit::WebFrame* frame) OVERRIDE;
  25   virtual void ClosePage() OVERRIDE;
  26
  27   // Dump all page load histograms appropriate for the given frame.
  28   //
  29   // This method will only dump once-per-instance, so it is safe to call
  30   // multiple times.
  31   //
  32   // The time points we keep are
  33   //    request: time document was requested by user
  34   //    start: time load of document started
  35   //    commit: time load of document started
  36   //    finish_document: main document loaded, before onload()
  37   //    finish_all_loads: after onload() and all resources are loaded
  38   //    first_paint: first paint performed
  39   //    first_paint_after_load: first paint performed after load is finished
  40   //    begin: request if it was user requested, start otherwise
  41   //
  42   // It's possible for the request time not to be set, if a client
  43   // redirect had been done (the user never requested the page)
  44   // Also, it's possible to load a page without ever laying it out
  45   // so first_paint and first_paint_after_load can be 0.
  46   void Dump(WebKit::WebFrame* frame);
  47
  48   void ResetCrossFramePropertyAccess();
  49
  50   void LogPageLoadTime(const content::DocumentState* load_times,
  51                        const WebKit::WebDataSource* ds) const;
  52
  53   // Site isolation metric counts.
  54   // These are per-page-load counts, reset to 0 after they are dumped.
  55   int cross_origin_access_count_;
  56   int same_origin_access_count_;
  57
  58   RendererHistogramSnapshots* histogram_snapshots_;
  59
  60   DISALLOW_COPY_AND_ASSIGN(PageLoadHistograms);
  61 };
  62
  63 #endif  // CHROME_RENDERER_PAGE_LOAD_HISTOGRAMS_H_