Implement the persistent metro mode setting (win8)

win8/delegate_execute/chrome_util.cc

Index: win8/delegate_execute/chrome_util.cc
===================================================================
--- win8/delegate_execute/chrome_util.cc	(revision 156164)
+++ win8/delegate_execute/chrome_util.cc	(working copy)
@@ -264,4 +264,15 @@
   return app_id.append(suffix);
 }
 
+bool IsMachineATablet() {
+  // A tablet by this definition is something that has integrated multi-touch
+  // but is not also pen-enabled. For example a Thinkpad X220 tablet is not
+  // considered a tabled while a Samsum 700T tablet is.
+  const int kPenInput = NID_INTEGRATED_PEN | NID_EXTERNAL_PEN;
+  const int kMultiTouch = NID_INTEGRATED_TOUCH | NID_MULTI_INPUT | NID_READY;
+  int sm = GetSystemMetrics(SM_DIGITIZER);
+  AtlTrace("GetSystemMetrics for SM_DIGITIZER is 0x%x\n", sm);
+  return ((sm & kMultiTouch) == kMultiTouch) && ((sm & kPenInput) == 0);
+}
+
 }  // delegate_execute