Implement rewind: drop one or more frames from the debugger.

runtime/observatory/tests/service/service.status

Index: runtime/observatory/tests/service/service.status
diff --git a/runtime/observatory/tests/service/service.status b/runtime/observatory/tests/service/service.status
index bb0c4331206cbe3e62a4b59199e92c30a63040c0..17c5e22f6a53aa74f9f59a6a3fd83e81cff22800 100644
--- a/runtime/observatory/tests/service/service.status
+++ b/runtime/observatory/tests/service/service.status
@@ -63,6 +63,8 @@ evaluate_activation_in_method_class_test: CompileTimeError # Issue 24478
 get_allocation_samples_test: RuntimeError # Profiling unimplemented.
 get_cpu_profile_timeline_rpc_test: RuntimeError # Profiling unimplemented.
 implicit_getter_setter_test: RuntimeError # Field guards unimplemented.
+rewind_test: RuntimeError # Rewind not implemented.

[Cutch, 2016/11/22 22:27:50]

simdbc is important for Flutter development is there a bug # to reference for
dbc support?

[turnidge, 2016/11/22 22:54:06]

Added a tracking bug.

+rewind_optimized_out_test: RuntimeError # Rewind not implemented.
 
 [ $hot_reload || $hot_reload_rollback ]
 # Skip all service tests because random reloads interfere.