[chromeos]Allow input method can get tab key when inputting in omnibox.

chrome/browser/views/location_bar/location_bar_view.cc

 // Copyright (c) 2010 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 "chrome/browser/views/location_bar/location_bar_view.h"
 
 #if defined(OS_LINUX)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 867 matching lines @@
     // We want to receive tab key events when the hint is showing.
     return true;
   }
 
 #if defined(OS_WIN)
   return location_entry_->SkipDefaultKeyEventProcessing(e);
 #else
   // TODO(jcampan): We need to refactor the code of
   // AutocompleteEditViewWin::SkipDefaultKeyEventProcessing into this class so
   // it can be shared between Windows and Linux.
-  // For now, we just override back-space as it is the accelerator for back
-  // navigation.
-  if (e.GetKeyCode() == base::VKEY_BACK)
+  // For now, we just override back-space and tab keys, as back-space is the
+  // accelerator for back navigation and tab key is used by some input methods.
+  if (e.GetKeyCode() == base::VKEY_BACK ||
+      views::FocusManager::IsTabTraversalKeyEvent(e))
     return true;
   return false;
 #endif
 }
 
 bool LocationBarView::GetAccessibleRole(AccessibilityTypes::Role* role) {
   DCHECK(role);
 
   *role = AccessibilityTypes::ROLE_GROUPING;
   return true;
@@ skipping 136 matching lines @@
         page_action_views_[i]->image_view()->ExecuteAction(kLeftMouseButton,
             false);  // inspect_with_devtools
         return;
       }
       ++current;
     }
   }
 
   NOTREACHED();
 }