dbus-c++: report DBUS_ERROR_OBJECT_PATH_IN_USE error This CL modifies ObjectAdaptor::register_obj() to throw an ErrorObjectPathInUse exception if it fails to register a handler for a given path in the DBus object hierarchy (i.e. upon a DBUS_ERROR_OBJECT_PATH_IN_USE error). BUG=chromium:392903 TEST=Tested the following: 1. `emerge-$BOARD dbus-c++` 2. Manually modify shill to register a DBus adaptor with the same object path twice, and verify that an ErrorObjectPathInUse exception is raised. Change-Id: Ied787112ecd04aae67c6b78060d8cedb03eeda73 Reviewed-on: https://chromium-review.googlesource.com/207344 Reviewed-by: mukesh agrawal <quiche@chromium.org> Commit-Queue: Ben Chan <benchan@chromium.org> Tested-by: Ben Chan <benchan@chromium.org>
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