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

chrome/browser/extensions/external_component_loader.cc

Index: chrome/browser/extensions/external_component_loader.cc
diff --git a/chrome/browser/extensions/external_component_loader.cc b/chrome/browser/extensions/external_component_loader.cc
index ecfc18bd44fc9a0558e92dbc6f11fa79f8c52fa4..9d82fbabe3dbd57e2b175108a2a443185635b942 100644
--- a/chrome/browser/extensions/external_component_loader.cc
+++ b/chrome/browser/extensions/external_component_loader.cc
@@ -5,6 +5,8 @@
 #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"
@@ -16,6 +18,7 @@
 #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 {
 
@@ -58,6 +61,26 @@ void ExternalComponentLoader::StartLoading() {
   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();