Add the Windows.IsPinnedToTaskbar metric.

chrome/browser/shell_integration_win.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_SHELL_INTEGRATION_WIN_H_
 #define CHROME_BROWSER_SHELL_INTEGRATION_WIN_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 39 matching lines @@
 // Note: If the app has an installation specific suffix (e.g. on user-level
 // Chrome installs), |app_name| should already be suffixed, this method will
 // then further suffix it with the profile id as described above.
 base::string16 GetAppModelIdForProfile(const base::string16& app_name,
                                        const base::FilePath& profile_path);
 
 // Generates an application user model ID (AppUserModelId) for Chromium by
 // calling GetAppModelIdForProfile() with ShellUtil::GetAppId() as app_name.
 base::string16 GetChromiumModelIdForProfile(const base::FilePath& profile_path);
 
+// Records the pinned state of the current executable into a histogram.

[gab, 2016/06/30 15:28:11]

Document that this must be called on the IO thread.

+void RecordIsPinnedToTaskbarHistogram();
+
 // Migrates existing chrome taskbar pins by tagging them with correct app id.
 // see http://crbug.com/28104
 void MigrateTaskbarPins();
 
 // Migrates all shortcuts in |path| which point to |chrome_exe| such that they
 // have the appropriate AppUserModelId. Also clears the legacy dual_mode
 // property from shortcuts with the default chrome app id.
 // Returns the number of shortcuts migrated.
 // This method should not be called prior to Windows 7.
 // This method is only public for the sake of tests and shouldn't be called
 // externally otherwise.
 int MigrateShortcutsInPathInternal(const base::FilePath& chrome_exe,
                                    const base::FilePath& path);
 
 // Returns the path to the Start Menu shortcut for the given Chrome.
 base::FilePath GetStartMenuShortcut(const base::FilePath& chrome_exe);
 
 }  // namespace win
 }  // namespace shell_integration
 
 #endif  // CHROME_BROWSER_SHELL_INTEGRATION_WIN_H_