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

chrome/browser/search/hotword_service.cc

Index: chrome/browser/search/hotword_service.cc
diff --git a/chrome/browser/search/hotword_service.cc b/chrome/browser/search/hotword_service.cc
index dec32729a9423fcca60ac1fef1381dfd695af354..c8bf7052843e9341eb97979ae99b4535468377eb 100644
--- a/chrome/browser/search/hotword_service.cc
+++ b/chrome/browser/search/hotword_service.cc
@@ -438,6 +438,12 @@ bool HotwordService::IsOptedIntoAudioLogging() {
       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)
@@ -501,6 +507,9 @@ void HotwordService::StopHotwordSession(HotwordClient* client) {
   if (!IsServiceAvailable())
     return;
 
+  // Do nothing if there's no client.
+  if (!client_)
+    return;
   DCHECK(client_ == client);
 
   client_ = NULL;