gtk: Show a tooltip for the location icon in the omnibox.

chrome/browser/ui/gtk/location_bar_view_gtk.cc

 // Copyright (c) 2011 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/ui/gtk/location_bar_view_gtk.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 335 matching lines @@
 
   // Put the event box in an alignment to get the padding correct.
   site_type_alignment_ = gtk_alignment_new(0, 0, 1, 1);
   gtk_alignment_set_padding(GTK_ALIGNMENT(site_type_alignment_),
                             1, 1, 0, 0);
   gtk_container_add(GTK_CONTAINER(site_type_alignment_),
                     site_type_event_box_);
   gtk_box_pack_start(GTK_BOX(hbox_.get()), site_type_alignment_,
                      FALSE, FALSE, 0);
 
+  gtk_widget_set_tooltip_text(location_icon_image_,
+      l10n_util::GetStringUTF8(IDS_TOOLTIP_LOCATION_ICON).c_str());
+
   g_signal_connect(site_type_event_box_, "button-release-event",
                    G_CALLBACK(&OnIconReleasedThunk), this);
 }
 
 void LocationBarViewGtk::SetSiteTypeDragSource() {
   bool enable = !location_entry()->IsEditingOrEmpty();
   if (enable_location_drag_ == enable)
     return;
   enable_location_drag_ = enable;
 
@@ skipping 1180 matching lines @@
 
   std::string badge_text = page_action_->GetBadgeText(tab_id);
   if (badge_text.empty())
     return FALSE;
 
   gfx::CanvasSkiaPaint canvas(event, false);
   gfx::Rect bounding_rect(widget->allocation);
   page_action_->PaintBadge(&canvas, bounding_rect, tab_id);
   return FALSE;
 }