Add an UMA metric to track whether chrome is running on a tablet.

base/win/win_util.h

 // Copyright (c) 2012 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.
 
 // =============================================================================
 // PLEASE READ
 //
 // In general, you should not be adding stuff to this file.
 //
 // - If your thing is only used in one place, just put it in a reasonable
@@ skipping 93 matching lines @@
 BASE_EXPORT bool ShouldCrashOnProcessDetach();
 
 // Adjusts the abort behavior so that crash reports can be generated when the
 // process is aborted.
 BASE_EXPORT void SetAbortBehaviorForCrashReporting();
 
 // A touch enabled device by this definition is something that has
 // integrated multi-touch ready to use and has Windows version > Windows7.
 BASE_EXPORT bool IsTouchEnabledDevice();
 
+// A tablet is a device that is touch enabled and also is being used
+// "like a tablet".  This is used primarily for metrics in order to gain some
+// insight into how users use Chrome.
+BASE_EXPORT bool IsTabletDevice();
+
 // Get the size of a struct up to and including the specified member.
 // This is necessary to set compatible struct sizes for different versions
 // of certain Windows APIs (e.g. SystemParametersInfo).
 #define SIZEOF_STRUCT_WITH_SPECIFIED_LAST_MEMBER(struct_name, member) \
     offsetof(struct_name, member) + \
     (sizeof static_cast<struct_name*>(NULL)->member)
 
 // Displays the on screen keyboard on Windows 8 and above. Returns true on
 // success.
 BASE_EXPORT bool DisplayVirtualKeyboard();
 
 // Dismisses the on screen keyboard if it is being displayed on Windows 8 and.
 // above. Returns true on success.
 BASE_EXPORT bool DismissVirtualKeyboard();
 
 // Returns true if the machine is enrolled to a domain.
 BASE_EXPORT bool IsEnrolledToDomain();
 
 // Used by tests to mock any wanted state. Call with |state| set to true to
 // simulate being in a domain and false otherwise.
 BASE_EXPORT void SetDomainStateForTesting(bool state);
 
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_WIN_UTIL_H_