Ensure that tips change when the Chrome language changes.

BUG= http://crbug.com/21394
TEST= Change chrome language.  Close and reopen browser.  Tips should appear in new language, or, if not available, they should not appear.

Review URL: http://codereview.chromium.org/199073

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25834 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/dom_ui/tips_handler.cc

@@ -4,6 +4,7 @@
 
 #include "base/string_util.h"
 #include "base/values.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/dom_ui/tips_handler.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/web_resource/web_resource_service.h"
@@ -35,6 +36,20 @@ void TipsHandler::HandleGetTips(const Value* content) {
   int current_tip_index;
   std::string current_tip;
 
+  // If tips are not correct for our locale, do not send.  Wait for update.
+  // We need to check here because the new tab page calls for tips before
+  // the tip service starts up.
+  PrefService* current_prefs = dom_ui_->GetProfile()->GetPrefs();
+  if (current_prefs->HasPrefPath(prefs::kNTPTipsServer)) {
+    std::wstring server = current_prefs->GetString(prefs::kNTPTipsServer);
+    std::wstring locale = ASCIIToWide(
+        g_browser_process->GetApplicationLocale());
+    if (!EndsWith(server, locale, false)) {
+      dom_ui_->CallJavascriptFunction(L"tips", list_value);
+      return;
+    }
+  }
+
   if (tips_cache_ != NULL && tips_cache_->GetSize() >= 0) {
     if (tips_cache_->GetInteger(
         WebResourceService::kCurrentTipPrefName, &current_tip_index) &&

chrome/browser/web_resource/web_resource_service.cc

@@ -196,15 +196,20 @@ void WebResourceService::Init() {
   resource_dispatcher_host_ = g_browser_process->resource_dispatcher_host();
   web_resource_fetcher_ = new WebResourceFetcher(this);
   prefs_->RegisterStringPref(prefs::kNTPTipsCacheUpdate, L"0");
+  std::wstring locale = ASCIIToWide(g_browser_process->GetApplicationLocale());
 
-  // TODO(mirandac): allow for language change without wiping out prefs file.
   if (prefs_->HasPrefPath(prefs::kNTPTipsServer)) {
-    web_resource_server_ = prefs_->GetString(prefs::kNTPTipsServer);
-  } else {
-    web_resource_server_ = kDefaultResourceServer;
-    web_resource_server_.append(
-      ASCIIToWide(g_browser_process->GetApplicationLocale()));
+     web_resource_server_ = prefs_->GetString(prefs::kNTPTipsServer);
+     // If we are in the correct locale, initialization is done.
+     if (EndsWith(web_resource_server_, locale, false))
+       return;
   }
+
+  // If we have not yet set a server, or if the tips server is set to the wrong
+  // locale, reset the server and force an immediate update of tips.
+  web_resource_server_ = kDefaultResourceServer;
+  web_resource_server_.append(locale);
+  prefs_->SetString(prefs::kNTPTipsCacheUpdate, L"");
 }
 
 void WebResourceService::EndFetch() {
@@ -258,13 +263,15 @@ void WebResourceService::StartAfterDelay() {
   if (prefs_->HasPrefPath(prefs::kNTPTipsCacheUpdate)) {
     std::wstring last_update_pref =
       prefs_->GetString(prefs::kNTPTipsCacheUpdate);
-    int ms_until_update = kCacheUpdateDelay -
-        static_cast<int>((base::Time::Now() - base::Time::FromDoubleT(
-        StringToDouble(WideToASCII(last_update_pref)))).InMilliseconds());
-
-    delay = ms_until_update > kCacheUpdateDelay ?
-            kCacheUpdateDelay : (ms_until_update < kStartResourceFetchDelay ?
-                                 kStartResourceFetchDelay : ms_until_update);
+    if (!last_update_pref.empty()) {
+      int ms_until_update = kCacheUpdateDelay -
+          static_cast<int>((base::Time::Now() - base::Time::FromDoubleT(
+          StringToDouble(WideToASCII(last_update_pref)))).InMilliseconds());
+
+      delay = ms_until_update > kCacheUpdateDelay ?
+              kCacheUpdateDelay : (ms_until_update < kStartResourceFetchDelay ?
+                                   kStartResourceFetchDelay : ms_until_update);
+    }
   }
 
   // Start fetch and wait for UpdateResourceCache.