Adds HotwordPrivate API for integrating the hotword feature to AppLauncher

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/i18n/case_conversion.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "ui/base/l10n/l10n_util.h"
 
+// The whole file relies on the extension systems but this file is built on
+// some non-extension supported platforms and including an API header will cause
+// a compile error since it depends on header files generated by .idl.
+// TODO(mukai): clean up file dependencies and remove this clause.
+#if defined(ENABLE_EXTENSIONS)
+#include "chrome/browser/extensions/api/hotword_private/hotword_private_api.h"
+#endif
+
+#if defined(ENABLE_EXTENSIONS)
+using extensions::BrowserContextKeyedAPIFactory;
+using extensions::HotwordPrivateEventService;
+#endif
+
 namespace {
 const int kMaxTimesToShowOptInPopup = 10;
 
 // Allowed languages for hotwording.
 static const char* kSupportedLocales[] = {
   "en",
   "de",
   "fr",
   "ru"
 };
@@ skipping 82 matching lines @@
   StringToLowerASCII(&normalized_locale);
 
   for (size_t i = 0; i < arraysize(kSupportedLocales); i++) {
     if (normalized_locale.compare(0, 2, kSupportedLocales[i]) == 0)
       return true;
   }
   return false;
 }
 
 HotwordService::HotwordService(Profile* profile)
-    : profile_(profile) {
+    : profile_(profile),
+      client_(NULL) {
   // This will be called during profile initialization which is a good time
   // to check the user's hotword state.
   HotwordEnabled enabled_state = UNSET;
   if (profile_->GetPrefs()->HasPrefPath(prefs::kHotwordSearchEnabled)) {
     if (profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled))
       enabled_state = ENABLED;
     else
       enabled_state = DISABLED;
   } else {
     // If the preference has not been set the hotword extension should
@@ skipping 132 matching lines @@
 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);
 }
+
+void HotwordService::RequestHotwordSession(HotwordClient* client) {
+#if defined(ENABLE_EXTENSIONS)
+  if (!IsServiceAvailable() || client_)
+    return;
+
+  client_ = client;
+
+  HotwordPrivateEventService* event_service =
+      BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(profile_);
+  if (event_service)
+    event_service->OnHotwordSessionRequested();
+#endif
+}
+
+void HotwordService::StopHotwordSession(HotwordClient* client) {
+#if defined(ENABLE_EXTENSIONS)
+  if (!IsServiceAvailable())
+    return;
+
+  DCHECK(client_ == client);
+
+  client_ = NULL;
+  HotwordPrivateEventService* event_service =
+      BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(profile_);
+  if (event_service)
+    event_service->OnHotwordSessionStopped();
+#endif
+}