Fix debugging of async code

runtime/vm/debugger.h

 // 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.
 
 #ifndef VM_DEBUGGER_H_
 #define VM_DEBUGGER_H_
 
 #include "include/dart_debugger_api.h"
 
 #include "vm/object.h"
@@ skipping 30 matching lines @@
   RawString* SourceUrl();
   intptr_t LineNumber();
 
   void GetCodeLocation(Library* lib, Script* script, intptr_t* token_pos);
 
   void Enable();
   void Disable();
   bool IsEnabled() const { return is_enabled_; }
   bool IsResolved() const { return is_resolved_; }
 
+  bool IsOneShot() const { return is_one_shot_; }
+  void SetIsOneShot() { is_one_shot_ = true; }
+
   void PrintJSON(JSONStream* stream);
 
  private:
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   void SetResolved(const Function& func, intptr_t token_pos);
   void set_next(SourceBreakpoint* value) { next_ = value; }
   SourceBreakpoint* next() const { return this->next_; }
 
   const intptr_t id_;
   RawScript* script_;
   intptr_t token_pos_;
   intptr_t end_token_pos_;
   bool is_resolved_;
   bool is_enabled_;
+  bool is_one_shot_;
   SourceBreakpoint* next_;
 
   // Valid for resolved breakpoints:
   RawFunction* function_;
   intptr_t line_number_;
 
   friend class Debugger;
   DISALLOW_COPY_AND_ASSIGN(SourceBreakpoint);
 };
 
@@ skipping 370 matching lines @@
                              intptr_t start_pos,
                              intptr_t end_pos,
                              GrowableObjectArray* function_list);
   RawFunction* FindBestFit(const Script& script, intptr_t token_pos);
   RawFunction* FindInnermostClosure(const Function& function,
                                     intptr_t token_pos);
   intptr_t ResolveBreakpointPos(const Function& func,
                                 intptr_t requested_token_pos,
                                 intptr_t last_token_pos);
   void DeoptimizeWorld();
-  RawError* SetInternalBreakpoints(const Function& target_function);
   SourceBreakpoint* SetBreakpoint(const Script& script,
                                   intptr_t token_pos,
                                   intptr_t last_token_pos);
   void RemoveInternalBreakpoints();
   void UnlinkCodeBreakpoints(SourceBreakpoint* src_bpt);
   void RegisterSourceBreakpoint(SourceBreakpoint* bpt);
   void RegisterCodeBreakpoint(CodeBreakpoint* bpt);
   SourceBreakpoint* GetSourceBreakpoint(const Script& script,
                                         intptr_t token_pos);
   void MakeCodeBreakpointAt(const Function& func,
@@ skipping 76 matching lines @@
 
   friend class Isolate;
   friend class SourceBreakpoint;
   DISALLOW_COPY_AND_ASSIGN(Debugger);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DEBUGGER_H_