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

BUG=353701
R=cpu@chromium.org, isherman@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/262773015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@268825 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 44 insertions, 0 deletions

diff --git a/base/base.gyp b/base/base.gyp
index e8b7d30..6127c4b 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -183,6 +183,18 @@
             ],
           },
         }],
+        ['OS == "win"', {
+          'msvs_settings': {
+            'VCLinkerTool': {
+              'DelayLoadDLLs': [
+                'powrprof.dll',
+              ],
+              'AdditionalDependencies': [
+                'powrprof.lib',
+              ],
+            },
+          },
+        }],
         ['OS != "win" and OS != "ios"', {
             'dependencies': ['../third_party/libevent/libevent.gyp:libevent'],
         },],
diff --git a/base/win/win_util.cc b/base/win/win_util.cc
index 601dd7c..061b2a4 100644
--- a/base/win/win_util.cc
+++ b/base/win/win_util.cc
@@ -6,6 +6,7 @@
 
 #include <aclapi.h>
 #include <lm.h>
+#include <powrprof.h>
 #include <shellapi.h>
 #include <shlobj.h>
 #include <shobjidl.h>  // Must be before propkey.
@@ -232,6 +233,32 @@ bool IsTouchEnabledDevice() {
   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.
+  POWER_PLATFORM_ROLE role = PowerDeterminePlatformRole();
+  bool mobile_power_profile = (role == PlatformRoleMobile);
+  bool slate_power_profile = false;
+  if (version >= base::win::VERSION_WIN8)
+    slate_power_profile = (role == PlatformRoleSlate);
+
+  if (mobile_power_profile || slate_power_profile)
+    return (GetSystemMetrics(SM_CONVERTIBLESLATEMODE) == 0);
+
+  return false;
+}
+
 bool DisplayVirtualKeyboard() {
   if (base::win::GetVersion() < base::win::VERSION_WIN8)
     return false;
diff --git a/base/win/win_util.h b/base/win/win_util.h
index 4a5c5cd..1c3f0f3 100644
--- a/base/win/win_util.h
+++ b/base/win/win_util.h
@@ -111,6 +111,11 @@ BASE_EXPORT void SetAbortBehaviorForCrashReporting();
 // 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).