[Hotword] Implement IsHotwordHardwareAvailable() using device types.

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 31 matching lines @@
 #include "content/public/common/webplugininfo.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/uninstall_reason.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/one_shot_event.h"
 #include "grit/theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#if defined(OS_CHROMEOS)
+#include "chromeos/audio/cras_audio_handler.h"
+#endif
+
 using extensions::BrowserContextKeyedAPIFactory;
 using extensions::HotwordPrivateEventService;
 
 namespace {
 
 // Allowed languages for hotwording.
 static const char* kSupportedLocales[] = {
   "en",
   "de",
   "fr",
@@ skipping 238 matching lines @@
 #endif
 
 HotwordService::HotwordService(Profile* profile)
     : profile_(profile),
       extension_registry_observer_(this),
       client_(NULL),
       error_message_(0),
       reinstall_pending_(false),
       training_(false),
       weak_factory_(this) {
+#if defined(OS_CHROMEOS)
+  // Tests on chromeos need to have the handler initialized.
+  if (profile_->AsTestingProfile() &&
+      !chromeos::CrasAudioHandler::IsInitialized())
+    chromeos::CrasAudioHandler::InitializeForTesting();
+#endif
+
   extension_registry_observer_.Add(extensions::ExtensionRegistry::Get(profile));
   if (IsExperimentalHotwordingEnabled()) {
     // Disable the old extension so it doesn't interfere with the new stuff.
     DisableHotwordExtension(GetExtensionService(profile_));
   } else {
     if (!profile_->GetPrefs()->HasPrefPath(prefs::kHotwordSearchEnabled) &&
         IsHotwordAllowed()) {
       // If the preference has not been set the hotword extension should
       // not be running. However, this should only be done if auto-install
       // is enabled which is gated through the IsHotwordAllowed check.
@@ skipping 507 matching lines @@
   HotwordPrivateEventService* event_service =
       BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(profile_);
   // "enabled" isn't being changed, but piggy-back off the notification anyway.
   if (event_service)
     event_service->OnEnabledChanged(prefs::kHotwordSearchEnabled);
 }
 
 bool HotwordService::UserIsActive() {
   return profile_ == ProfileManager::GetActiveUserProfile();
 }