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

src/inspector/debugger-script.js

Index: src/inspector/debugger-script.js
diff --git a/src/inspector/debugger-script.js b/src/inspector/debugger-script.js
index 9d917b6df73540cb167c5dcd370a430216d1f8a6..6ed10c7aac76a7dd86ac84afa20406e4d589b74d 100644
--- a/src/inspector/debugger-script.js
+++ b/src/inspector/debugger-script.js
@@ -420,11 +420,12 @@ DebuggerScript._frameMirrorToJSCallFrame = function(frameMirror)
 
     /**
      * @param {string} expression
+     * @param {boolean} throwOnSideEffect
      * @return {*}
      */
-    function evaluate(expression)
+    function evaluate(expression, throwOnSideEffect)
     {
-        return frameMirror.evaluate(expression).value();
+        return frameMirror.evaluate(expression, throwOnSideEffect).value();
     }
 
     /** @return {undefined} */