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

runtime/vm/debugger_api_impl.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_tools_api.h"
 
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 467 matching lines @@
   CHECK_DEBUGGER(I);
   I->debugger()->RemoveBreakpoint(bp_id);
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_SetStepOver() {
   DARTSCOPE(Thread::Current());
   Isolate* I = T->isolate();
   CHECK_DEBUGGER(I);
-  I->debugger()->SetStepOver();
+  I->debugger()->SetResumeAction(Debugger::kStepOver);
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_SetStepInto() {
   DARTSCOPE(Thread::Current());
   Isolate* I = T->isolate();
   CHECK_DEBUGGER(I);
-  I->debugger()->SetSingleStep();
+  I->debugger()->SetResumeAction(Debugger::kStepInto);
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_SetStepOut() {
   DARTSCOPE(Thread::Current());
   Isolate* I = T->isolate();
   CHECK_DEBUGGER(I);
-  I->debugger()->SetStepOut();
+  I->debugger()->SetResumeAction(Debugger::kStepOut);
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_GetInstanceFields(Dart_Handle object_in) {
   DARTSCOPE(Thread::Current());
   Isolate* I = T->isolate();
   CHECK_DEBUGGER(I);
   UNWRAP_AND_CHECK_PARAM(Instance, obj, object_in);
   return Api::NewHandle(T, I->debugger()->GetInstanceFields(obj));
@@ skipping 466 matching lines @@
 
 #else
 
 DART_EXPORT void Dart_SetPausedEventHandler(Dart_PausedEventHandler handler) {
   // NOOP.
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart