Use DOM- rather than Windows-based key code for non-layout cases.

ui/events/event_unittest.cc

 // Copyright (c) 2012 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 "base/memory/scoped_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/dom3/dom_code.h"
 #include "ui/events/keycodes/dom4/keycode_converter.h"
@@ skipping 333 matching lines @@
     KeyEvent key(ET_KEY_PRESSED, VKEY_SPACE, kDomCodeForSpace, EF_NONE);
     EXPECT_EQ(kCodeForSpace, key.GetCodeString());
   }
   {
     // Regardless the KeyEvent.key_code (VKEY_RETURN), code should be
     // the specified value.
     KeyEvent key(ET_KEY_PRESSED, VKEY_RETURN, kDomCodeForSpace, EF_NONE);
     EXPECT_EQ(kCodeForSpace, key.GetCodeString());
   }
   {
-    // If the synthetic event is initialized without code, it returns
-    // an empty string.
-    // TODO(komatsu): Fill a fallback value assuming the US keyboard layout.
+    // If the synthetic event is initialized without code, the code is
+    // determined from the KeyboardCode assuming a US keyboard layout.
     KeyEvent key(ET_KEY_PRESSED, VKEY_SPACE, EF_NONE);
-    EXPECT_TRUE(key.GetCodeString().empty());
+    EXPECT_EQ(kCodeForSpace, key.GetCodeString());
   }
 #if defined(USE_X11)
   {
     // KeyEvent converts from the native keycode (XKB) to the code.
     ScopedXI2Event xevent;
     xevent.InitKeyEvent(ET_KEY_PRESSED, VKEY_SPACE, kNativeCodeSpace);
     KeyEvent key(xevent);
     EXPECT_EQ(kCodeForSpace, key.GetCodeString());
   }
 #endif  // USE_X11
@@ skipping 139 matching lines @@
   DCHECK_EQ(non_zero_length1, event1.radius_x());
   DCHECK_EQ(non_zero_length1, event1.radius_y());
 
   TouchEvent event2(ui::ET_TOUCH_PRESSED, gfx::Point(0, 0), 0, 0, time,
                     0, non_zero_length2, 0, 0);
   DCHECK_EQ(non_zero_length2, event2.radius_x());
   DCHECK_EQ(non_zero_length2, event2.radius_y());
 }
 
 }  // namespace ui