Add the Windows.IsPinnedToTaskbar metric.

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"
@@ skipping 34 matching lines @@
 #endif
 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)
 
 #if defined(USE_OZONE) || defined(USE_X11)
 #include "ui/events/devices/input_device_event_observer.h"
 #include "ui/events/devices/input_device_manager.h"
 #endif  // defined(USE_OZONE) || defined(USE_X11)
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
+#include "chrome/browser/shell_integration_win.h"
 #include "chrome/installer/util/google_update_settings.h"
 #endif  // defined(OS_WIN)
 
 namespace {
 
 enum UMALinuxGlibcVersion {
   UMA_LINUX_GLIBC_NOT_PARSEABLE,
   UMA_LINUX_GLIBC_UNKNOWN,
   UMA_LINUX_GLIBC_2_11,
   // To log newer versions, just update tools/metrics/histograms/histograms.xml.
@@ skipping 282 matching lines @@
 
 #if defined(OS_MACOSX)
   RecordMacMetrics();
 #endif  // defined(OS_MACOSX)
 
   const int kStartupMetricsGatheringDelaySeconds = 45;
   content::BrowserThread::GetBlockingPool()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&RecordStartupMetricsOnBlockingPool),
       base::TimeDelta::FromSeconds(kStartupMetricsGatheringDelaySeconds));
+#if defined(OS_WIN)
+  content::BrowserThread::PostDelayedTask(
+      content::BrowserThread::IO, FROM_HERE,
+      base::Bind(&shell_integration::win::RecordIsPinnedToTaskbarHistogram),
+      base::TimeDelta::FromSeconds(kStartupMetricsGatheringDelaySeconds));

[dcheng, 2016/07/01 05:46:55]

Nit: I think kStartupMetricsGatheringDelaySeconds can just be a base::TimeDelta
directly now: https://codereview.chromium.org/1976703005

[Patrick Monette, 2016/07/04 15:36:15]

Done.

+#endif  // defined(OS_WIN)
+
 
   display_count_ = display::Screen::GetScreen()->GetNumDisplays();
   UMA_HISTOGRAM_COUNTS_100("Hardware.Display.Count.OnStartup", display_count_);
   display::Screen::GetScreen()->AddObserver(this);
   is_screen_observer_ = true;
 
 #if !defined(OS_ANDROID)
   FirstWebContentsProfiler::Start();
 #endif  // !defined(OS_ANDROID)
 }
@@ skipping 20 matching lines @@
   }
 }
 
 namespace chrome {
 
 void AddMetricsExtraParts(ChromeBrowserMainParts* main_parts) {
   main_parts->AddParts(new ChromeBrowserMainExtraPartsMetrics());
 }
 
 }  // namespace chrome