Add function for one-time stop at function entry

runtime/vm/debugger.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 "vm/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 1108 matching lines @@
         cbpt->Enable();
       } else {
         cbpt->Disable();
       }
     }
     cbpt = cbpt->next();
   }
 }
 
 
+void Debugger::OneTimeBreakAtEntry(const Function& target_function) {
+  InstrumentForStepping(target_function);
+}
+
+
 SourceBreakpoint* Debugger::SetBreakpointAtEntry(
       const Function& target_function) {
   ASSERT(!target_function.IsNull());
   return SetBreakpoint(target_function,
                        target_function.token_pos(),
                        target_function.end_token_pos());
 }
 
 
 SourceBreakpoint* Debugger::SetBreakpointAtLine(const String& script_url,
@@ skipping 584 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart