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

chromeos/dbus/dbus_client_bundle.h

Index: chromeos/dbus/dbus_client_bundle.h
diff --git a/chromeos/dbus/dbus_client_bundle.h b/chromeos/dbus/dbus_client_bundle.h
index 176e3ac8351ef4db538f097baba20f1d55f0cdce..529a966e0173847d033dfdd1aa8c43d5d47449af 100644
--- a/chromeos/dbus/dbus_client_bundle.h
+++ b/chromeos/dbus/dbus_client_bundle.h
@@ -36,15 +36,15 @@ class ShillThirdPartyVpnDriverClient;
 class SystemClockClient;
 class UpdateEngineClient;
 
+// Declared outside of DBusClientBundle to make identifiers shorter in outside
+// classes.
+using DBusClientTypeMask = int;
+
 // The bundle of all D-Bus clients used in DBusThreadManager. The bundle
 // is used to delete them at once in the right order before shutting down the
 // system bus. See also the comment in the destructor of DBusThreadManager.
 class CHROMEOS_EXPORT DBusClientBundle {
  public:
-  typedef int DBusClientTypeMask;
-
-  // TODO(zelidrag): We might want to collapse few more of these subsystems if
-  // their dbus interfaced correspond to the same daemon.
   enum DBusClientType {
     NO_CLIENT = 0,
     BLUETOOTH = 1 << 0,
@@ -65,13 +65,23 @@ class CHROMEOS_EXPORT DBusClientBundle {
     SYSTEM_CLOCK = 1 << 15,
     UPDATE_ENGINE = 1 << 16,
     ARC_OBB_MOUNTER = 1 << 17,
+    ALL_CLIENTS = ~NO_CLIENT,
   };
 
-  explicit DBusClientBundle(DBusClientTypeMask unstub_client_mask);
+  // Creates real implementations for |real_client_mask| and fakes for
+  // |fake_client_mask|. The masks must be mutually exclusive. Fakes are used
+  // when running on Linux desktop and in tests. If a client does not appear in
+  // either mask then no implementation will be created and the getters below
+  // will return null.
+  DBusClientBundle(DBusClientTypeMask real_client_mask,
+                   DBusClientTypeMask fake_client_mask);
   ~DBusClientBundle();
 
-  // Returns true if |client| is stubbed.
-  bool IsUsingStub(DBusClientType client);
+  // Returns true if |client| is faked.
+  bool IsUsingFake(DBusClientType client) const;
+
+  // Returns true if |client| has the real client implementation.
+  bool IsUsingReal(DBusClientType client) const;
 
   // Returns true if any real DBusClient is used.
   bool IsUsingAnyRealClient();
@@ -79,8 +89,8 @@ class CHROMEOS_EXPORT DBusClientBundle {
   // Initialize proper runtime environment for its dbus clients.
   void SetupDefaultEnvironment();
 
-  // Parses command line param values for dbus subsystem that should be
-  // un-stubbed.
+  // Parses command line param values for dbus subsystems that should be forced
+  // to use real implementations.
   static DBusClientTypeMask ParseUnstubList(const std::string& unstub_list);
 
   ArcObbMounterClient* arc_obb_mounter_client() {
@@ -174,10 +184,14 @@ class CHROMEOS_EXPORT DBusClientBundle {
  private:
   friend class DBusThreadManagerSetter;
 
-  // Bitmask that defines which dbus clients are not stubbed out. Bitmap flags
-  // are defined within DBusClientType enum.
-  DBusClientTypeMask unstub_client_mask_;
+  // Bitmask for clients with real implementations. See DBusClientType.
+  const DBusClientTypeMask real_client_mask_;
+
+  // Bitmask for clients with fake implementations. See DBusClientType.
+  const DBusClientTypeMask fake_client_mask_;
 
+  // May be null if the current process does not use the client (e.g. in the
+  // ash process on mustash).
   std::unique_ptr<ArcObbMounterClient> arc_obb_mounter_client_;
   std::unique_ptr<CrasAudioClient> cras_audio_client_;
   std::unique_ptr<CrosDisksClient> cros_disks_client_;