Initial work on Linux tab to search.

chrome/browser/autocomplete/autocomplete_edit_view_gtk.cc

 // Copyright (c) 2009 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/autocomplete/autocomplete_edit_view_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
 #include "app/l10n_util.h"
@@ skipping 441 matching lines @@
 
 gboolean AutocompleteEditViewGtk::HandleKeyPress(GtkWidget* widget,
                                                  GdkEventKey* event) {
   // This is very similar to the special casing of the return key in the
   // GtkTextView key_press default handler.  TODO(deanm): We do however omit
   // some IME related code, this might become a problem if an IME wants to
   // handle enter.  We can get at the im_context and do it ourselves if needed.
   if (event->keyval == GDK_Return ||
       event->keyval == GDK_ISO_Enter ||
       event->keyval == GDK_KP_Enter ||
+      event->keyval == GDK_Tab ||
      (event->keyval == GDK_Escape && event->state == 0)) {
     // Handle IME. This is basically taken from GtkTextView and reworked a bit.
     GtkTextIter iter;
     GtkTextView* text_view = GTK_TEXT_VIEW(text_view_);
     GtkTextMark* insert = gtk_text_buffer_get_insert(text_buffer_);
     gtk_text_buffer_get_iter_at_mark(text_buffer_, &iter, insert);
     gboolean can_insert = gtk_text_iter_can_insert(&iter, text_view->editable);
     if (gtk_im_context_filter_keypress(text_view->im_context, event)) {
       // The IME handled it, do the follow up IME handling.
       if (!can_insert) {
         gtk_im_context_reset(text_view->im_context);
       } else {
         text_view->need_im_reset = TRUE;
       }
     } else {
       // Ok, not handled by the IME, we can handle it.
-      if (event->keyval == GDK_Escape) {
+      if (event->keyval == GDK_Tab) {
+        if (model_->is_keyword_hint() && !model_->keyword().empty()) {
+          model_->AcceptKeyword();
+        } else {
+          return FALSE;  // Let GtkTextView handle the tab focus change.
+        }
+      } else if (event->keyval == GDK_Escape) {
         model_->OnEscapeKeyPressed();
       } else {
         bool alt_held = (event->state & GDK_MOD1_MASK);
         model_->AcceptInput(alt_held ? NEW_FOREGROUND_TAB : CURRENT_TAB, false);
       }
     }
     return TRUE;  // Don't propagate into GtkTextView.
   }
 
   return FALSE;  // Propagate into GtkTextView.
@@ skipping 255 matching lines @@
     const std::string& selected_text) {
   GtkClipboard* clipboard =
       gtk_widget_get_clipboard(text_view_, GDK_SELECTION_PRIMARY);
   DCHECK(clipboard);
   if (!clipboard)
     return;
 
   gtk_clipboard_set_text(
       clipboard, selected_text.data(), selected_text.size());
 }