[debugger] make strict eval-scope visible to debugging.

test/mjsunit/debug-evaluate-nested.js

 // Copyright 2016 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.
 
 // Flags: --expose-debug-as debug
 
 Debug = debug.Debug;
 ScopeType = debug.ScopeType;
 var exception = null;
 var nested = false;
@@ skipping 16 matching lines @@
   if (event != Debug.DebugEvent.Break) return;
   try {
     if (!nested) {
       nested = true;
       checkScopes(exec_state.frame(0).allScopes(),
                   [ ScopeType.With, ScopeType.Local, ScopeType.Closure,
                     ScopeType.Script, ScopeType.Global ]);
       exec_state.frame(0).evaluate("debugger;");
     } else {
       checkScopes(exec_state.frame(0).allScopes(),
-                  [ ScopeType.With, ScopeType.Closure,
+                  [ ScopeType.Eval, ScopeType.With, ScopeType.Closure,
                     ScopeType.Script, ScopeType.Global ]);
     }
   } catch (e) {
     exception = e;
     print(e + e.stack);
   }
 }
 
 Debug.setListener(listener);
 bar();
 Debug.setListener(null);
 assertNull(exception);