mash: Allow a subset of D-Bus clients to be created in DBusThreadManager

ash/common/dbus_thread_manager_ash.cc

+#include "ash/common/dbus_thread_manager_ash.h"
+
+#include "chromeos/dbus/dbus_thread_manager.h"
+
+namespace ash {
+namespace {
+
+DBusThreadManagerAsh* g_instance = nullptr;
+
+}  // namespace
+
+// static
+DBusThreadManagerAsh* DBusThreadManagerAsh::Get() {
+  CHECK(g_instance);
+  return g_instance;
+}
+
+DBusThreadManagerAsh::DBusThreadManagerAsh() {
+  DCHECK(!g_instance);
+  g_instance = this;
+
+  // Ensure the services we need are initialized.
+  chromeos::DBusThreadManager* manager = chromeos::DBusThreadManager::Get();
+  DCHECK(manager->GetPowerManagerClient());
+  DCHECK(manager->GetSessionManagerClient());
+  DCHECK(manager->GetSystemClockClient());
+}
+
+DBusThreadManagerAsh::~DBusThreadManagerAsh() {
+  DCHECK_EQ(this, g_instance);
+  g_instance = nullptr;
+}
+
+//JAMES for now, just forward
+chromeos::PowerManagerClient* DBusThreadManagerAsh::GetPowerManagerClient() {
+  return chromeos::DBusThreadManager::Get()->GetPowerManagerClient();
+}
+
+chromeos::SessionManagerClient* DBusThreadManagerAsh::GetSessionManagerClient() {
+  return chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
+}
+
+chromeos::SystemClockClient* DBusThreadManagerAsh::GetSystemClockClient() {
+  return chromeos::DBusThreadManager::Get()->GetSystemClockClient();
+}
+
+}  // namespace ash