[debugger] expose side-effect free evaluate to inspector.

src/debug/mirrors.js

 // Copyright 2006-2012 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.
 
 (function(global, utils) {
 "use strict";
 
 // ----------------------------------------------------------------------------
 // Imports
 
@@ skipping 1901 matching lines @@
                                           !!opt_ignore_nested_scopes);
   var result = [];
   for (var i = 0; i < scopeDetails.length; ++i) {
     result.push(new ScopeMirror(this, UNDEFINED, UNDEFINED, i,
                                 scopeDetails[i]));
   }
   return result;
 };
 
 
-FrameMirror.prototype.evaluate = function(source) {
+FrameMirror.prototype.evaluate = function(source, throw_on_side_effect = false) {
   return MakeMirror(%DebugEvaluate(this.break_id_,
                                    this.details_.frameId(),
                                    this.details_.inlinedFrameIndex(),
-                                   source));
+                                   source,
+                                   throw_on_side_effect));
 };
 
 
 FrameMirror.prototype.invocationText = function() {
   // Format frame invoaction (receiver, function and arguments).
   var result = '';
   var func = this.func();
   var receiver = this.receiver();
   if (this.isConstructCall()) {
     // For constructor frames display new followed by the function name.
@@ skipping 463 matching lines @@
   "GeneratorMirror", GeneratorMirror,
   "PropertyMirror", PropertyMirror,
   "InternalPropertyMirror", InternalPropertyMirror,
   "FrameMirror", FrameMirror,
   "ScriptMirror", ScriptMirror,
   "ScopeMirror", ScopeMirror,
   "FrameDetails", FrameDetails,
 ]);
 
 })