Don't kill key events even when it's VKEY_UNKNOWN.

ui/aura/window_targeter.cc

 // Copyright (c) 2013 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 "ui/aura/window_targeter.h"
 
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/client/event_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/window.h"
@@ skipping 68 matching lines @@
       return target;
     }
   }
   return EventTargeter::FindTargetForLocatedEvent(root, event);
 }
 
 Window* WindowTargeter::FindTargetForKeyEvent(Window* window,
                                               const ui::KeyEvent& key) {
   Window* root_window = window->GetRootWindow();
   if (key.key_code() == ui::VKEY_UNKNOWN &&
-      (key.flags() & ui::EF_IME_FABRICATED_KEY) == 0)
+      (key.flags() & ui::EF_IME_FABRICATED_KEY) == 0 &&
+      key.GetCharacter() == 0)
     return NULL;
   client::FocusClient* focus_client = client::GetFocusClient(root_window);
   Window* focused_window = focus_client->GetFocusedWindow();
   if (!focused_window)
     return window;
 
   client::EventClient* event_client = client::GetEventClient(root_window);
   if (event_client &&
       !event_client->CanProcessEventsWithinSubtree(focused_window)) {
     focus_client->FocusWindow(NULL);
@@ skipping 34 matching lines @@
 
     // If the initial touch is outside the root window, target the root.
     if (!root_window->bounds().Contains(event.location()))
       return root_window;
   }
 
   return NULL;
 }
 
 }  // namespace aura