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

src/inspector/js_protocol.json

Index: src/inspector/js_protocol.json
diff --git a/src/inspector/js_protocol.json b/src/inspector/js_protocol.json
index aadd98aaa729580b6eee93f7f1f3e6edf3291836..4f69d728640e5762ec301e7a596fd36caae7ad0c 100644
--- a/src/inspector/js_protocol.json
+++ b/src/inspector/js_protocol.json
@@ -633,6 +633,7 @@
                     { "name": "expression", "type": "string", "description": "Expression to evaluate." },
                     { "name": "objectGroup", "type": "string", "optional": true, "description": "String object group name to put result into (allows rapid releasing resulting object handles using <code>releaseObjectGroup</code>)." },
                     { "name": "includeCommandLineAPI", "type": "boolean", "optional": true, "description": "Specifies whether command line API should be available to the evaluated expression, defaults to false." },
+                    { "name": "allowSideEffect", "type": "boolean", "optional": true, "description": "If side effect is not allowed, throw an exception if side effect cannot be ruled out during evaluation." },

[pfeldman, 2017/02/07 23:11:25]

fromMaybe(true) is not good, please reverse the condition. throwOnSideEffect?

                     { "name": "silent", "type": "boolean", "optional": true, "description": "In silent mode exceptions thrown during evaluation are not reported and do not pause execution. Overrides <code>setPauseOnException</code> state." },
                     { "name": "returnByValue", "type": "boolean", "optional": true, "description": "Whether the result is expected to be a JSON object that should be sent by value." },
                     { "name": "generatePreview", "type": "boolean", "optional": true, "experimental": true, "description": "Whether preview should be generated for the result." }