Adds a skeleton component app for Always-On Hotwording opt-in flow.

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"
 #include "base/path_service.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/hotword_private/hotword_private_api.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/pending_extension_manager.h"
 #include "chrome/browser/extensions/updater/extension_updater.h"
 #include "chrome/browser/extensions/webstore_startup_installer.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/hotword_service_factory.h"
+#include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/plugin_service.h"
 #include "content/public/common/webplugininfo.h"
 #include "extensions/browser/extension_system.h"
@@ skipping 174 matching lines @@
   }
   UMA_HISTOGRAM_ENUMERATION("Hotword.Enabled", enabled_state,
                             NUM_HOTWORD_ENABLED_METRICS);
 
   pref_registrar_.Init(profile_->GetPrefs());
   pref_registrar_.Add(
       prefs::kHotwordSearchEnabled,
       base::Bind(&HotwordService::OnHotwordSearchEnabledChanged,
                  base::Unretained(this)));
 
+  pref_registrar_.Add(
+      prefs::kHotwordAlwaysOnSearchEnabled,
+      base::Bind(&HotwordService::OnHotwordAlwaysOnSearchEnabledChanged,
+                 base::Unretained(this)));
+
   registrar_.Add(this,
                  chrome::NOTIFICATION_BROWSER_WINDOW_READY,
                  content::NotificationService::AllSources());
 
   extensions::ExtensionSystem::Get(profile_)->ready().Post(
       FROM_HERE,
       base::Bind(base::IgnoreResult(
           &HotwordService::MaybeReinstallHotwordExtension),
                  weak_factory_.GetWeakPtr()));
 
@@ skipping 210 matching lines @@
 
 void HotwordService::DisableHotwordExtension(
     ExtensionService* extension_service) {
   if (extension_service) {
     extension_service->DisableExtension(
         extension_misc::kHotwordExtensionId,
         extensions::Extension::DISABLE_USER_ACTION);
   }
 }
 
+void HotwordService::OnHotwordAlwaysOnSearchEnabledChanged(
+    const std::string& pref_name) {
+  DCHECK_EQ(pref_name, std::string(prefs::kHotwordAlwaysOnSearchEnabled));
+
+  ExtensionService* extension_service = GetExtensionService(profile_);
+  if (!extension_service)
+    return;
+
+  const extensions::Extension* extension = extension_service->GetExtensionById(
+      extension_misc::kHotwordAudioVerificationAppId, true);
+  if (!extension)
+    return;
+
+  if (profile_->GetPrefs()->GetBoolean(prefs::kHotwordAlwaysOnSearchEnabled)) {
+    OpenApplication(AppLaunchParams(
+        profile_, extension, extensions::LAUNCH_CONTAINER_WINDOW, NEW_WINDOW));
+  }
+}
+
 void HotwordService::OnHotwordSearchEnabledChanged(
     const std::string& pref_name) {
   DCHECK_EQ(pref_name, std::string(prefs::kHotwordSearchEnabled));
 
   ExtensionService* extension_service = GetExtensionService(profile_);
   if (profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled))
     EnableHotwordExtension(extension_service);
   else
     DisableHotwordExtension(extension_service);
 }
@@ skipping 35 matching lines @@
     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_);
 }