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 false;

[cpu_(ooo_6.6-7.5), 2014/05/06 00:38:46]

please remove the less than xp branch.

+  } else if (version == base::win::VERSION_XP) {
+    return (GetSystemMetrics(SM_TABLETPC) != 0);

[cpu_(ooo_6.6-7.5), 2014/05/06 00:38:46]

mmmm, I was expecting you return false here. 

I mean say it is used like a tablet, do we want to treat it like a tablet?

[zturner, 2014/05/06 00:49:36]

I would think yes?  I mean Windows XP tablets are a strange concept, so maybe we
want to exclude them just based on that alone.  But if we want to exclude
Windows XP tablets just because we don't want to support tablets on that OS,
then maybe the OS check should be at a higher level, like whoever calls this
function.

+  }
+
+  // If the device is docked, the user is treating the device as a PC.
+  if (GetSystemMetrics(SM_SYSTEMDOCKED) != 0)

[cpu_(ooo_6.6-7.5), 2014/05/06 00:38:46]

nice. 

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