shill: Support for GSM network scanning.

This is mostly placeholder code since synchronous calls will cause crashes due
to timeouts.

BUG=chromium-os:19805
TEST=unit tests

Change-Id: I7ad07d6274b19b39d7955ee256c6928c9f1ce5a1
Reviewed-on: http://gerrit.chromium.org/gerrit/7895
Commit-Ready: Darin Petkov <petkov@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
diff --git a/mock_device.h b/mock_device.h
index fd73d6c..4c3fa9b 100644
--- a/mock_device.h
+++ b/mock_device.h
@@ -29,7 +29,7 @@
 
   MOCK_METHOD0(Start, void());
   MOCK_METHOD0(Stop, void());
-  MOCK_METHOD0(Scan, void());
+  MOCK_METHOD1(Scan, void(Error *error));
   MOCK_CONST_METHOD1(TechnologyIs, bool(const Technology technology));
 
  private: