Hotword: Adds a field for always_on_available to the API StatusDetails

This field is used when deciding whether to show the NTP promo.

BUG=436681

Review URL: https://codereview.chromium.org/1011913005

Cr-Commit-Position: refs/heads/master@{#320874}

chrome/browser/extensions/api/hotword_private/hotword_private_api.cc

@@ -151,12 +151,15 @@ bool HotwordPrivateGetStatusFunction::RunSync() {
       HotwordServiceFactory::GetForProfile(GetProfile());
   if (!hotword_service) {
     result.available = false;
+    result.always_on_available = false;
     result.enabled = false;
     result.audio_logging_enabled = false;
     result.always_on_enabled = false;
     result.user_is_active = false;
   } else {
     result.available = hotword_service->IsServiceAvailable();
+    result.always_on_available =
+        HotwordServiceFactory::IsAlwaysOnAvailable();
     result.enabled = hotword_service->IsSometimesOnEnabled();
     result.audio_logging_enabled = hotword_service->IsOptedIntoAudioLogging();
     result.training_enabled = hotword_service->IsTraining();

chrome/browser/resources/hotword/page_audio_manager.js

@@ -454,8 +454,10 @@ cr.define('hotword', function() {
     statusDone_: function(tab, sendResponse, hotwordStatus) {
       var response = {'doNotShowOptinMessage': true};
 
+      // If always-on is available, then we do not show the promo, as the promo
+      // only works with the sometimes-on pref.
       if (!tab.incognito && hotwordStatus.available &&
-          !hotwordStatus.enabledSet) {
+          !hotwordStatus.enabledSet && !hotwordStatus.alwaysOnAvailable) {
         response = hotwordStatus;
       }
 

chrome/common/extensions/api/hotword_private.idl

@@ -23,6 +23,9 @@ namespace hotwordPrivate {
     // Whether the hotword extension is available to be enabled
     boolean available;
 
+    // Whether always-on is available to be enabled
+    boolean alwaysOnAvailable;
+
     // Whether the sound of "Ok, Google" plus a few seconds before is sent
     // back to Google.
     boolean audioLoggingEnabled;