ash: Add a heads-up display to track touch-point states and positions.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index a9add694426bf1507af4633e72a168e5073ffc24..a7734b1462dfa2604c76d1e6a334bf8aa1283579 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -725,13 +725,20 @@ const Experiment kExperiments[] = {
     SINGLE_VALUE_TYPE(switches::kShowLauncherAlignmentMenu)
   },
   {
+    "show-touch-hud",
+    IDS_FLAGS_SHOW_TOUCH_HUD_NAME,
+    IDS_FLAGS_SHOW_TOUCH_HUD_DESCRIPTION,
+    kOsAll,
+    SINGLE_VALUE_TYPE(ash::switches::kAshTouchHud)
+  },
+  {
     "ash-notify",
     IDS_FLAGS_ENABLE_ASH_NOTIFY_NAME,
     IDS_FLAGS_ENABLE_ASH_NOTIFY_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(ash::switches::kAshNotify),
   },
-#endif
+#endif  // defined(USE_ASH)
 };
 
 const Experiment* experiments = kExperiments;