MediaPerceptionPrivate API impl and testing.

chromeos/dbus/fake_upstart_client.cc

Index: chromeos/dbus/fake_upstart_client.cc
diff --git a/chromeos/dbus/fake_upstart_client.cc b/chromeos/dbus/fake_upstart_client.cc
index aec1044a9478d7af28f1aaa4763b684ac44f2536..620a2bee53cae8be5633f129a00af0ec657ea169 100644
--- a/chromeos/dbus/fake_upstart_client.cc
+++ b/chromeos/dbus/fake_upstart_client.cc
@@ -10,7 +10,9 @@
 
 namespace chromeos {
 
-FakeUpstartClient::FakeUpstartClient() {}
+FakeUpstartClient::FakeUpstartClient()
+    : start_media_analytics_will_succeed_(true),
+      start_media_analytics_will_stall_(false) {}
 
 FakeUpstartClient::~FakeUpstartClient() {}
 
@@ -30,14 +32,28 @@ void FakeUpstartClient::RestartAuthPolicyService() {
   authpolicy_client->set_started(true);
 }
 
+void FakeUpstartClient::SetStartMediaAnalyticsWillSucceed(bool will_succeed) {
+  start_media_analytics_will_succeed_ = will_succeed;
+}
+
+void FakeUpstartClient::SetStartMediaAnalyticsWillStall(bool will_stall) {
+  start_media_analytics_will_stall_ = will_stall;
+}
+
 void FakeUpstartClient::StartMediaAnalytics(const UpstartCallback& callback) {
+  if (!start_media_analytics_will_succeed_) {
+    callback.Run(false);
+    return;
+  }
   FakeMediaAnalyticsClient* media_analytics_client =
       static_cast<FakeMediaAnalyticsClient*>(
           DBusThreadManager::Get()->GetMediaAnalyticsClient());
   DLOG_IF(WARNING, media_analytics_client->process_running())
       << "Trying to start media analytics which is already started.";
   media_analytics_client->set_process_running(true);
-  callback.Run(true);
+  if (!start_media_analytics_will_stall_) {
+    callback.Run(true);
+  }
 }
 
 void FakeUpstartClient::StopMediaAnalytics() {