Open the launcher when hotword is triggered in always-on mode.

chrome/browser/search/hotword_service.cc

 // Copyright 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/search/hotword_service.h"
 
 #include "base/command_line.h"
 #include "base/i18n/case_conversion.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 420 matching lines @@
       DoesHotwordSupportLanguage(profile_);
 }
 
 bool HotwordService::IsOptedIntoAudioLogging() {
   // Do not opt the user in if the preference has not been set.
   return
       profile_->GetPrefs()->HasPrefPath(prefs::kHotwordAudioLoggingEnabled) &&
       profile_->GetPrefs()->GetBoolean(prefs::kHotwordAudioLoggingEnabled);
 }
 
+bool HotwordService::IsAlwaysOnEnabled() {
+  return
+      profile_->GetPrefs()->HasPrefPath(prefs::kHotwordAlwaysOnSearchEnabled) &&
+      profile_->GetPrefs()->GetBoolean(prefs::kHotwordAlwaysOnSearchEnabled);
+}
+
 void HotwordService::EnableHotwordExtension(
     ExtensionService* extension_service) {
   if (extension_service)
     extension_service->EnableExtension(extension_misc::kHotwordExtensionId);
 }
 
 void HotwordService::DisableHotwordExtension(
     ExtensionService* extension_service) {
   if (extension_service) {
     extension_service->DisableExtension(
@@ skipping 43 matching lines @@
   HotwordPrivateEventService* event_service =
       BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(profile_);
   if (event_service)
     event_service->OnHotwordSessionRequested();
 }
 
 void HotwordService::StopHotwordSession(HotwordClient* client) {
   if (!IsServiceAvailable())
     return;
 
+  // Do nothing if there's no client.
+  if (!client_)
+    return;
   DCHECK(client_ == client);
 
   client_ = NULL;
   HotwordPrivateEventService* event_service =
       BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(profile_);
   if (event_service)
     event_service->OnHotwordSessionStopped();
 }
 
 void HotwordService::SetPreviousLanguagePref() {
   profile_->GetPrefs()->SetString(prefs::kHotwordPreviousLanguage,
                                   GetCurrentLocale(profile_));
 }
 
 bool HotwordService::ShouldReinstallHotwordExtension() {
   // If there is no previous locale pref, then this is the first install
   // so no need to uninstall first.
   if (!profile_->GetPrefs()->HasPrefPath(prefs::kHotwordPreviousLanguage))
     return false;
 
   std::string previous_locale =
       profile_->GetPrefs()->GetString(prefs::kHotwordPreviousLanguage);
   std::string locale = GetCurrentLocale(profile_);
 
   // If it's a new locale, then the old extension should be uninstalled.
   return locale != previous_locale &&
       HotwordService::DoesHotwordSupportLanguage(profile_);
 }