This CL makes the TranslationService class send the text to be translated to ...

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
===================================================================
--- chrome/browser/tab_contents/tab_contents.cc	(revision 37411)
+++ chrome/browser/tab_contents/tab_contents.cc	(working copy)
@@ -45,6 +45,7 @@
 #include "chrome/browser/renderer_host/render_widget_host_view.h"
 #include "chrome/browser/renderer_host/resource_request_details.h"
 #include "chrome/browser/renderer_host/site_instance.h"
+#include "chrome/browser/renderer_host/translation_service.h"
 #include "chrome/browser/renderer_host/web_cache_manager.h"
 #include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/sessions/session_types.h"
@@ -1807,6 +1808,19 @@
     entry->set_language(language);
   }
 
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kAutoPageTranslate) &&
+      TranslationService::IsTranslationEnabled()) {
+    std::string locale = g_browser_process->GetApplicationLocale();

[jungshik at Google, 2010/01/30 01:27:17]

nit: perhaps, s/locale/ui_language/ and s/language/page_language/ would be
clearer.

+    if (!locale.empty() && locale != language) {
+      // Don't translate the NTP, download page, history...
+      if (entry && !entry->url().SchemeIs("chrome") &&
+          TranslationService::ShouldTranslatePage(language, locale)) {
+        render_view_host()->TranslatePage(entry->page_id(), language, locale);
+      }
+    }
+  }
+
   std::string lang = language;
   NotificationService::current()->Notify(
       NotificationType::TAB_LANGUAGE_DETERMINED,