Adds HotwordPrivate API for integrating the hotword feature to AppLauncher

chrome/browser/search/hotword_service.cc

Index: chrome/browser/search/hotword_service.cc
diff --git a/chrome/browser/search/hotword_service.cc b/chrome/browser/search/hotword_service.cc
index 86dfc68be170775d0dbb83da29fd69911fa476a4..78a0face9a478066b0a6b7cd45d4fbbf6b2c0e6f 100644
--- a/chrome/browser/search/hotword_service.cc
+++ b/chrome/browser/search/hotword_service.cc
@@ -10,6 +10,7 @@
 #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/profiles/profile.h"
 #include "chrome/common/extensions/extension_constants.h"
@@ -20,6 +21,9 @@
 #include "extensions/common/extension.h"
 #include "ui/base/l10n/l10n_util.h"
 
+using extensions::BrowserContextKeyedAPIFactory;
+using extensions::HotwordPrivateEventService;
+
 namespace {
 const int kMaxTimesToShowOptInPopup = 10;
 
@@ -122,7 +126,8 @@ bool HotwordService::DoesHotwordSupportLanguage(Profile* profile) {
 }
 
 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;
@@ -275,3 +280,28 @@ void HotwordService::OnHotwordSearchEnabledChanged(
   else
     DisableHotwordExtension(extension_service);
 }
+
+void HotwordService::RequestHotwordSession(HotwordClient* client) {
+  if (!IsServiceAvailable() || client_)
+    return;
+
+  client_ = client;
+
+  HotwordPrivateEventService* event_service =
+      BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(profile_);
+  if (event_service)
+    event_service->OnHotwordSessionRequested();
+}
+
+void HotwordService::StopHotwordSession(HotwordClient* client) {
+  if (!IsServiceAvailable())
+    return;
+
+  DCHECK(client_ == client);
+
+  client_ = NULL;
+  HotwordPrivateEventService* event_service =
+      BrowserContextKeyedAPIFactory<HotwordPrivateEventService>::Get(profile_);
+  if (event_service)
+    event_service->OnHotwordSessionStopped();
+}