Hotword Private API: Add function and event to query the existence of a speaker model

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 <string>
 
 #include "base/command_line.h"
 #include "base/i18n/case_conversion.h"
@@ skipping 686 matching lines @@
 
 void HotwordService::DisableHotwordExtension(
     ExtensionService* extension_service) {
   if (extension_service) {
     extension_service->DisableExtension(
         extension_misc::kHotwordExtensionId,
         extensions::Extension::DISABLE_USER_ACTION);
   }
 }
 
+void HotwordService::SpeakerModelExistsComplete(bool exists) {
+  if (exists) {
+    profile_->GetPrefs()->
+        SetBoolean(prefs::kHotwordAlwaysOnSearchEnabled, true);
+  } else {
+    LaunchHotwordAudioVerificationApp(HotwordService::HOTWORD_ONLY);
+  }
+}
+
+void HotwordService::OptIntoHotwording(
+    const LaunchMode& launch_mode) {
+  // First determine if we actually need to launch the app, or can just enable
+  // the pref. If Audio History has already been enabled, and we already have
+  // a speaker model, then we don't need to launch the app at all.
+  if (launch_mode == HotwordService::HOTWORD_ONLY) {
+    HotwordPrivateEventService* event_service =
+        BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(
+            profile_);
+    if (event_service) {
+      event_service->OnSpeakerModelExists();
+      return;
+    }
+  }
+
+  LaunchHotwordAudioVerificationApp(launch_mode);
+}
+
 void HotwordService::LaunchHotwordAudioVerificationApp(
     const LaunchMode& launch_mode) {
   hotword_audio_verification_launch_mode_ = launch_mode;
 
   ExtensionService* extension_service = GetExtensionService(profile_);
   if (!extension_service)
     return;
   const extensions::Extension* extension = extension_service->GetExtensionById(
       extension_misc::kHotwordAudioVerificationAppId, true);
   if (!extension)
@@ skipping 167 matching lines @@
   // Only support multiple profiles and profile switching in ChromeOS.
   if (user_manager::UserManager::IsInitialized()) {
     user_manager::User* user =
         user_manager::UserManager::Get()->GetActiveUser();
     if (user && user->is_profile_created())
       return profile_ == ProfileManager::GetActiveUserProfile();
   }
 #endif
   return true;
 }