chrome/browser/metrics/first_web_contents_profiler.cc

   1 // Copyright 2014 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 #if !defined(OS_ANDROID)
   6
   7 #include "chrome/browser/metrics/first_web_contents_profiler.h"
   8
   9 #include "base/metrics/histogram_macros.h"
  10 #include "base/process/process_info.h"
  11 #include "base/time/time.h"
  12 #include "chrome/browser/ui/browser.h"
  13 #include "chrome/browser/ui/browser_iterator.h"
  14 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  15
  16 scoped_ptr<FirstWebContentsProfiler>
  17 FirstWebContentsProfiler::CreateProfilerForFirstWebContents(
  18     Delegate* delegate) {
  19   DCHECK(delegate);
  20   for (chrome::BrowserIterator iterator; !iterator.done(); iterator.Next()) {
  21     Browser* browser = *iterator;
  22     content::WebContents* web_contents =
  23         browser->tab_strip_model()->GetActiveWebContents();
  24     if (web_contents) {
  25       return scoped_ptr<FirstWebContentsProfiler>(
  26           new FirstWebContentsProfiler(web_contents, delegate));
  27     }
  28   }
  29   return nullptr;
  30 }
  31
  32 FirstWebContentsProfiler::FirstWebContentsProfiler(
  33     content::WebContents* web_contents,
  34     Delegate* delegate)
  35     : content::WebContentsObserver(web_contents),
  36       collected_paint_metric_(false),
  37       collected_load_metric_(false),
  38       delegate_(delegate) {
  39   process_creation_time_ = base::CurrentProcessInfo::CreationTime();
  40 }
  41
  42 void FirstWebContentsProfiler::DidFirstVisuallyNonEmptyPaint() {
  43   if (collected_paint_metric_)
  44     return;
  45
  46   collected_paint_metric_ = true;
  47   if (!process_creation_time_.is_null()) {
  48     base::TimeDelta elapsed = base::Time::Now() - process_creation_time_;
  49
  50     UMA_HISTOGRAM_LONG_TIMES_100("Startup.FirstWebContents.NonEmptyPaint",
  51                                  elapsed);
  52   }
  53
  54   if (IsFinishedCollectingMetrics())
  55     FinishedCollectingMetrics();
  56 }
  57
  58 void FirstWebContentsProfiler::DocumentOnLoadCompletedInMainFrame() {
  59   if (collected_load_metric_)
  60     return;
  61
  62   collected_load_metric_ = true;
  63   if (!process_creation_time_.is_null()) {
  64     base::TimeDelta elapsed = base::Time::Now() - process_creation_time_;
  65
  66     UMA_HISTOGRAM_LONG_TIMES_100("Startup.FirstWebContents.MainFrameLoad",
  67                                  elapsed);
  68   }
  69
  70   if (IsFinishedCollectingMetrics())
  71     FinishedCollectingMetrics();
  72 }
  73
  74 void FirstWebContentsProfiler::WebContentsDestroyed() {
  75   FinishedCollectingMetrics();
  76 }
  77
  78 bool FirstWebContentsProfiler::IsFinishedCollectingMetrics() {
  79   return collected_paint_metric_ && collected_load_metric_;
  80 }
  81
  82 void FirstWebContentsProfiler::FinishedCollectingMetrics() {
  83   delegate_->ProfilerFinishedCollectingMetrics();
  84 }
  85
  86 #endif  // !defined(OS_ANDROID)