ozone: evdev: Drop unmapped key events

ui/events/ozone/evdev/key_event_converter_evdev_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <linux/input.h>
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 336 matching lines @@
   event = dispatched_event(4);
   EXPECT_EQ(ui::ET_KEY_PRESSED, event->type());
   EXPECT_EQ(ui::VKEY_CAPITAL, event->key_code());
   EXPECT_EQ(0, event->flags());
 
   event = dispatched_event(5);
   EXPECT_EQ(ui::ET_KEY_RELEASED, event->type());
   EXPECT_EQ(ui::VKEY_CAPITAL, event->key_code());
   EXPECT_EQ(0, event->flags());
 }
+
+TEST_F(KeyEventConverterEvdevTest, UnmappedKeyPress) {
+  ui::MockKeyEventConverterEvdev* dev = device();
+
+  struct input_event mock_kernel_queue[] = {
+      {{0, 0}, EV_KEY, BTN_TOUCH, 1},
+      {{0, 0}, EV_SYN, SYN_REPORT, 0},
+
+      {{0, 0}, EV_KEY, BTN_TOUCH, 0},
+      {{0, 0}, EV_SYN, SYN_REPORT, 0},
+  };
+
+  dev->ProcessEvents(mock_kernel_queue, arraysize(mock_kernel_queue));
+  EXPECT_EQ(0u, size());
+}