Integrate the Spelling service to Chrome.

chrome/browser/tab_contents/render_view_context_menu_gtk.cc

Index: chrome/browser/tab_contents/render_view_context_menu_gtk.cc
===================================================================
--- chrome/browser/tab_contents/render_view_context_menu_gtk.cc	(revision 98595)
+++ chrome/browser/tab_contents/render_view_context_menu_gtk.cc	(working copy)
@@ -7,6 +7,7 @@
 #include <gtk/gtk.h>
 
 #include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 #include "content/browser/renderer_host/render_widget_host_view_gtk.h"
@@ -16,6 +17,60 @@
 #include "ui/gfx/gtk_util.h"
 #include "webkit/glue/context_menu.h"
 
+namespace {
+
+// A callback function for gtk_container_foreach(). This callback just checks
+// the menu ID and set the given user data if it is same as the specified ID.
+struct GtkWidgetAtParam {
+  int index;
+  GtkWidget* widget;
+};
+
+void GtkWidgetAt(GtkWidget* widget, gpointer user_data) {
+  GtkWidgetAtParam* param = reinterpret_cast<GtkWidgetAtParam*>(user_data);
+
+  gpointer data = g_object_get_data(G_OBJECT(widget), "menu-id");
+  if (data && (GPOINTER_TO_INT(data) - 1) == param->index &&
+      GTK_IS_MENU_ITEM(widget)) {
+    param->widget = widget;
+  }
+}
+
+// Retrieves a GtkWidget which has the specified command_id. This function
+// traverses the given |model| in the depth-first order. When this function
+// finds an item whose command_id is the same as the given |command_id|, it
+// returns the GtkWidget associated with the item. This function emulates
+// views::MenuItemViews::GetMenuItemByID() for GTK.
+GtkWidget* GetMenuItemByID(ui::MenuModel* model,
+                           GtkWidget* menu,
+                           int command_id) {
+  if (!menu)
+    return NULL;
+
+  for (int i = 0; i < model->GetItemCount(); ++i) {
+    if (model->GetCommandIdAt(i) == command_id) {
+      GtkWidgetAtParam param;
+      param.index = i;
+      param.widget = NULL;
+      gtk_container_foreach(GTK_CONTAINER(menu), &GtkWidgetAt, &param);
+      return param.widget;
+    }
+
+    ui::MenuModel* submenu = model->GetSubmenuModelAt(i);
+    if (submenu) {
+      GtkWidget* subitem = GetMenuItemByID(
+          submenu,
+          gtk_menu_item_get_submenu(GTK_MENU_ITEM(menu)),
+          command_id);
+      if (subitem)
+        return subitem;
+    }
+  }
+  return NULL;
+}
+
+}  // namespace
+
 RenderViewContextMenuGtk::RenderViewContextMenuGtk(
     TabContents* web_contents,
     const ContextMenuParams& params,
@@ -70,3 +125,16 @@
   return command_id >= IDC_EXTENSIONS_CONTEXT_CUSTOM_FIRST &&
       command_id <= IDC_EXTENSIONS_CONTEXT_CUSTOM_LAST;
 }
+
+void RenderViewContextMenuGtk::UpdateMenuItem(int command_id,
+                                              bool enabled,
+                                              const string16& title) {
+  GtkWidget* item = GetMenuItemByID(&menu_model_, menu_gtk_->widget(),
+                                    command_id);
+  if (!item || !GTK_IS_MENU_ITEM(item))
+    return;
+
+  // Enable (or disable) the menu item and updates its text.
+  gtk_widget_set_sensitive(item, enabled);
+  gtk_menu_item_set_label(GTK_MENU_ITEM(item), UTF16ToUTF8(title).c_str());
+}