[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 f1c41ac8092db584519bacb6e997ff64be356939..a0719ed493d246abcfae581fbf20a85757a1b4ac 100644
--- a/src/inspector/debugger-script.js
+++ b/src/inspector/debugger-script.js
@@ -445,11 +445,12 @@ 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} */