Include external touchscreen vid/pid in UMA hardware profile

ui/events/event_utils.cc

Index: ui/events/event_utils.cc
diff --git a/ui/events/event_utils.cc b/ui/events/event_utils.cc
index 8a3ba6699fedc37c674b88f900a9286aedceac50..e5a319e10f15bf0daab6633f98588eb86fd0b272 100644
--- a/ui/events/event_utils.cc
+++ b/ui/events/event_utils.cc
@@ -26,18 +26,22 @@ base::TimeDelta EventTimeForNow() {
 }
 
 bool ShouldDefaultToNaturalScroll() {
+  return GetInternalDisplayTouchSupport() ==
+      gfx::Display::TOUCH_SUPPORT_AVAILABLE;
+}
+
+gfx::Display::TouchSupport GetInternalDisplayTouchSupport() {
   gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
+  // No screen in some unit tests.
   if (!screen)
-    return false;
+    return gfx::Display::TOUCH_SUPPORT_UNKNOWN;
   const std::vector<gfx::Display>& displays = screen->GetAllDisplays();
   for (std::vector<gfx::Display>::const_iterator it = displays.begin();
        it != displays.end(); ++it) {
-    const gfx::Display& display = *it;
-    if (display.IsInternal() &&
-        display.touch_support() == gfx::Display::TOUCH_SUPPORT_AVAILABLE)
-      return true;
+    if (it->IsInternal())
+      return it->touch_support();
   }
-  return false;
+  return gfx::Display::TOUCH_SUPPORT_UNAVAILABLE;
 }
 
 }  // namespace ui