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

base/win/win_util.cc

 // 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.
 
 #include "base/win/win_util.h"
 
 #include <aclapi.h>
 #include <lm.h>
+#include <powrprof.h>
 #include <shellapi.h>
 #include <shlobj.h>
 #include <shobjidl.h>  // Must be before propkey.
 #include <initguid.h>
 #include <propkey.h>
 #include <propvarutil.h>
 #include <sddl.h>
 #include <signal.h>
 #include <stdlib.h>
 
@@ skipping 206 matching lines @@
   if (base::win::GetVersion() < base::win::VERSION_WIN7)
     return false;
   const int kMultiTouch = NID_INTEGRATED_TOUCH | NID_MULTI_INPUT | NID_READY;
   int sm = GetSystemMetrics(SM_DIGITIZER);
   if ((sm & kMultiTouch) == kMultiTouch) {
     return true;
   }
   return false;
 }
 
+bool IsTabletDevice() {
+  if (GetSystemMetrics(SM_MAXIMUMTOUCHES) == 0)
+    return false;
+
+  base::win::Version version = base::win::GetVersion();
+  if (version == base::win::VERSION_XP)
+    return (GetSystemMetrics(SM_TABLETPC) != 0);
+
+  // If the device is docked, the user is treating the device as a PC.
+  if (GetSystemMetrics(SM_SYSTEMDOCKED) != 0)
+    return false;
+
+  // PlatformRoleSlate was only added in Windows 8, but prior to Win8 it is
+  // still possible to check for a mobile power profile.
+  bool has_tablet_power_profile = false;

[cpu_(ooo_6.6-7.5), 2014/05/06 19:48:45]

seems we can init has_table_power_profile in line 252

+  POWER_PLATFORM_ROLE role = PowerDeterminePlatformRole();
+  has_tablet_power_profile = (role == PlatformRoleMobile);
+  if (version >= base::win::VERSION_WIN8)
+    has_tablet_power_profile |= (role == PlatformRoleSlate);

[cpu_(ooo_6.6-7.5), 2014/05/06 19:48:45]

the bitwise or scares me. Can you change to good ol || ?

+
+  if (has_tablet_power_profile) {
+    bool slate_mode = (GetSystemMetrics(SM_CONVERTIBLESLATEMODE) == 0);
+    return slate_mode;
+  }
+
+  return false;
+}
+
 bool DisplayVirtualKeyboard() {
   if (base::win::GetVersion() < base::win::VERSION_WIN8)
     return false;
 
   static base::LazyInstance<string16>::Leaky osk_path =
       LAZY_INSTANCE_INITIALIZER;
 
   if (osk_path.Get().empty()) {
     // We need to launch TabTip.exe from the location specified under the
     // LocalServer32 key for the {{054AAE20-4BEA-4347-8A35-64A533254A9D}}
@@ skipping 130 matching lines @@
 #if defined(_MSC_FULL_VER)
   #pragma message(__PPOUT__(_MSC_FULL_VER))
 #endif
 
 #pragma message("Visual Studio 2012 x86 must be updated to at least Update 1")
 #error Must install Update 1 to Visual Studio 2012.
 #endif
 
 #endif  // _MSC_VER