evdev: Fix crashing with touch devices

ui/events/ozone/evdev/touch_event_converter.cc

Index: ui/events/ozone/evdev/touch_event_converter.cc
diff --git a/ui/events/ozone/evdev/touch_event_converter.cc b/ui/events/ozone/evdev/touch_event_converter.cc
index 70752baf6a3b355e8bc0aff150af37adc66ebcf7..d95ebb6c5279dd649a03140ca5bbe8947b5f2d22 100644
--- a/ui/events/ozone/evdev/touch_event_converter.cc
+++ b/ui/events/ozone/evdev/touch_event_converter.cc
@@ -146,7 +146,7 @@ void TouchEventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
           altered_slots_.set(current_slot_);
           break;
         default:
-          NOTREACHED();
+          NOTREACHED() << "invalid code for EV_ABS: " << input.code;
       }
     } else if (input.type == EV_SYN) {
       switch (input.code) {
@@ -178,11 +178,18 @@ void TouchEventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
         case SYN_MT_REPORT:
         case SYN_CONFIG:
         case SYN_DROPPED:
-          NOTREACHED() << "SYN_MT events not supported.";
+          NOTREACHED() << "invalid code for EV_SYN: " << input.code;
           break;
       }
+    } else if (input.type == EV_KEY) {

[rjkroege, 2013/11/04 23:39:46]

it is possible to get key events on the touchscreen fd? does this actually ever
happen?

[spang, 2013/11/05 00:10:02]

Yes it happens. Only the BTN_TOUCH "key".

+      switch (input.code) {
+        case BTN_TOUCH:
+          break;
+        default:
+          NOTREACHED() << "invalid code for EV_KEY: " << input.code;
+      }
     } else {
-      NOTREACHED();
+      NOTREACHED() << "invalid type: " << input.type;
     }
   }
 }