[Hotword] Set up hotwording to be externally loaded component extension. Only load if the field tri…

chrome/browser/extensions/external_component_loader.cc

 // Copyright (c) 2013 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/extensions/external_component_loader.h"
 
 #include "base/command_line.h"
+#include "base/i18n/case_conversion.h"
+#include "base/metrics/field_trial.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
 #include "chrome/browser/bookmarks/enhanced_bookmarks_features.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/external_provider_impl.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "content/public/browser/browser_thread.h"
+#include "ui/base/l10n/l10n_util.h"
 
 namespace extensions {
 
 #if defined(OS_CHROMEOS)
 namespace {
 // Table mapping language codes to the extension ids of high-quality
 // speech synthesis extensions. See the comment in StartLoading() for more.
 struct LangToExtensionId {
   const char* lang;
   const char* extension_id;
@@ skipping 22 matching lines @@
 
 ExternalComponentLoader::~ExternalComponentLoader() {}
 
 void ExternalComponentLoader::StartLoading() {
   CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   prefs_.reset(new base::DictionaryValue());
   std::string appId = extension_misc::kInAppPaymentsSupportAppId;
   prefs_->SetString(appId + ".external_update_url",
                     extension_urls::GetWebstoreUpdateUrl().spec());
 
+  std::string group = base::FieldTrialList::FindFullName("VoiceTrigger");
+  if (!group.empty() && group != "Disabled") {
+    std::string locale =
+#if defined(OS_CHROMEOS)
+        // On ChromeOS locale is per-profile.
+        profile_->GetPrefs()->GetString(prefs::kApplicationLocale);
+#else
+        g_browser_process->GetApplicationLocale();
+#endif
+    // Only available for English now.
+    std::string normalized_locale = l10n_util::NormalizeLocale(locale);
+    if (!(strcmp(normalized_locale.c_str(), "en")) ||
+        !(strcmp(normalized_locale.c_str(), "en_us")) ||
+        !(strcmp(normalized_locale.c_str(), "en_US"))) {
+      std::string hotwordId = extension_misc::kHotwordExtensionId;
+      prefs_->SetString(hotwordId + ".external_update_url",
+                        extension_urls::GetWebstoreUpdateUrl().spec());
+    }
+  }
+
   if (CommandLine::ForCurrentProcess()->
           GetSwitchValueASCII(switches::kEnableEnhancedBookmarks) != "0") {
     std::string ext_id = GetEnhancedBookmarksExtensionId();
     if (!ext_id.empty()) {
       prefs_->SetString(ext_id + ".external_update_url",
                         extension_urls::GetWebstoreUpdateUrl().spec());
     }
   }
 
 #if defined(OS_CHROMEOS)
@@ skipping 33 matching lines @@
 // static
 void ExternalComponentLoader::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
 #if defined(OS_CHROMEOS)
   registry->RegisterListPref(prefs::kHighQualitySpeechSynthesisLanguages,
                              user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 #endif
 }
 
 }  // namespace extensions