[debugger] fix debug-evaluate wrt shadowed context var.

src/runtime/runtime-debug.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/debug/debug.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
@@ skipping 824 matching lines @@
 // 1: Scope object
 RUNTIME_FUNCTION(Runtime_GetAllScopesDetails) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 3 || args.length() == 4);
   CONVERT_NUMBER_CHECKED(int, break_id, Int32, args[0]);
   RUNTIME_ASSERT(isolate->debug()->CheckExecutionState(break_id));
 
   CONVERT_SMI_ARG_CHECKED(wrapped_id, 1);
   CONVERT_NUMBER_CHECKED(int, inlined_jsframe_index, Int32, args[2]);
 
-  bool ignore_nested_scopes = false;
+  ScopeIterator::Option option = ScopeIterator::DEFAULT;
   if (args.length() == 4) {
     CONVERT_BOOLEAN_ARG_CHECKED(flag, 3);
-    ignore_nested_scopes = flag;
+    if (flag) option = ScopeIterator::IGNORE_NESTED_SCOPES;
   }
 
   // Get the frame where the debugging is performed.
   StackFrame::Id id = DebugFrameHelper::UnwrapFrameId(wrapped_id);
   JavaScriptFrameIterator frame_it(isolate, id);
   JavaScriptFrame* frame = frame_it.frame();
   FrameInspector frame_inspector(frame, inlined_jsframe_index, isolate);
 
   List<Handle<JSObject> > result(4);
-  ScopeIterator it(isolate, &frame_inspector, ignore_nested_scopes);
+  ScopeIterator it(isolate, &frame_inspector, option);
   for (; !it.Done(); it.Next()) {
     Handle<JSObject> details;
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, details,
                                        it.MaterializeScopeDetails());
     result.Add(details);
   }
 
   Handle<FixedArray> array = isolate->factory()->NewFixedArray(result.length());
   for (int i = 0; i < result.length(); ++i) {
     array->set(i, *result[i]);
@@ skipping 832 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8