Refactor ownership model for FirstWebContentsProfiler.

chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/cpu.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/sys_info.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time/time.h"
 #include "chrome/browser/about_flags.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/mac/bluetooth_utility.h"
 #include "chrome/browser/shell_integration.h"
 #include "components/flags_ui/pref_service_flags_storage.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/touch/touch_device.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/events/event_switches.h"
 #include "ui/gfx/screen.h"
 
+#if !defined(OS_ANDROID)
+#include "chrome/browser/metrics/first_web_contents_profiler.h"
+#endif  // !defined(OS_ANDROID)
+
 #if defined(OS_ANDROID) && defined(__arm__)
 #include <cpu-features.h>
 #endif  // defined(OS_ANDROID) && defined(__arm__)
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include <gnu/libc-version.h>
 
 #include "base/version.h"
 #if defined(USE_X11)
 #include "ui/base/x/x11_util.h"
@@ skipping 297 matching lines @@
       FROM_HERE,
       base::Bind(&RecordStartupMetricsOnBlockingPool),
       base::TimeDelta::FromSeconds(kStartupMetricsGatheringDelaySeconds));
 
   display_count_ = gfx::Screen::GetNativeScreen()->GetNumDisplays();
   UMA_HISTOGRAM_COUNTS_100("Hardware.Display.Count.OnStartup", display_count_);
   gfx::Screen::GetNativeScreen()->AddObserver(this);
   is_screen_observer_ = true;
 
 #if !defined(OS_ANDROID)
-  first_web_contents_profiler_ =
-      FirstWebContentsProfiler::CreateProfilerForFirstWebContents(this).Pass();
+  FirstWebContentsProfiler::Start();
 #endif  // !defined(OS_ANDROID)
 }
 
 void ChromeBrowserMainExtraPartsMetrics::OnDisplayAdded(
     const gfx::Display& new_display) {
   EmitDisplaysChangedMetric();
 }
 
 void ChromeBrowserMainExtraPartsMetrics::OnDisplayRemoved(
     const gfx::Display& old_display) {
   EmitDisplaysChangedMetric();
 }
 
 void ChromeBrowserMainExtraPartsMetrics::OnDisplayMetricsChanged(
     const gfx::Display& display,
     uint32_t changed_metrics) {
 }
 
-#if !defined(OS_ANDROID)
-void ChromeBrowserMainExtraPartsMetrics::ProfilerFinishedCollectingMetrics() {
-  first_web_contents_profiler_.reset();
-}
-#endif  // !defined(OS_ANDROID)
-
 void ChromeBrowserMainExtraPartsMetrics::EmitDisplaysChangedMetric() {
   int display_count = gfx::Screen::GetNativeScreen()->GetNumDisplays();
   if (display_count != display_count_) {
     display_count_ = display_count;
     UMA_HISTOGRAM_COUNTS_100("Hardware.Display.Count.OnChange", display_count_);
   }
 }
 
 namespace chrome {
 
 void AddMetricsExtraParts(ChromeBrowserMainParts* main_parts) {
   main_parts->AddParts(new ChromeBrowserMainExtraPartsMetrics());
 }
 
 }  // namespace chrome