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 78 matching lines @@
   GoogleUpdateSettings::RecordChromeUpdatePolicyHistograms();
 
   const base::win::OSInfo& os_info = *base::win::OSInfo::GetInstance();
   UMA_HISTOGRAM_ENUMERATION("Windows.GetVersionExVersion", os_info.version(),
                             base::win::VERSION_WIN_LAST);
   UMA_HISTOGRAM_ENUMERATION("Windows.Kernel32Version",
                             os_info.Kernel32Version(),
                             base::win::VERSION_WIN_LAST);
   UMA_HISTOGRAM_BOOLEAN("Windows.InCompatibilityMode",
                         os_info.version() != os_info.Kernel32Version());
+  shell_integration::win::RecordIsPinnedToTaskbarHistogram();

[gab, 2016/06/28 20:59:18]

Feels overkill to bounce to the BlockingPool only to have this post a task to
the IO thread. I think PostBrowserStart() below should post a delayed task
directly on the IO thread.

[Patrick Monette, 2016/06/28 23:22:24]

Done.

 #endif  // defined(OS_WIN)
 
 #if defined(OS_MACOSX)
   bluetooth_utility::BluetoothAvailability availability =
       bluetooth_utility::GetBluetoothAvailability();
   UMA_HISTOGRAM_ENUMERATION("OSX.BluetoothAvailability",
                             availability,
                             bluetooth_utility::BLUETOOTH_AVAILABILITY_COUNT);
 #endif   // defined(OS_MACOSX)
 
@@ skipping 224 matching lines @@
   }
 }
 
 namespace chrome {
 
 void AddMetricsExtraParts(ChromeBrowserMainParts* main_parts) {
   main_parts->AddParts(new ChromeBrowserMainExtraPartsMetrics());
 }
 
 }  // namespace chrome