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

test/inspector/debugger/side-effect-free-debug-evaluate.js

+// Copyright 2017 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: --ignition
+
+InspectorTest.addScript(`
+function testFunction()
+{
+  var o = 0;
+  function f() { return 1; }
+  function g() { o = 2; return o; }
+  debugger;
+}
+//# sourceURL=foo.js`);
+
+Protocol.Debugger.enable();
+
+Protocol.Debugger.oncePaused().then(debuggerPaused);
+
+Protocol.Runtime.evaluate({ "expression": "setTimeout(testFunction, 0)" });
+
+var topFrameId;
+
+function debuggerPaused(messageObject)
+{
+  InspectorTest.log("Paused on 'debugger;'");
+
+  topFrameId = messageObject.params.callFrames[0].callFrameId;
+  Protocol.Debugger.evaluateOnCallFrame({ callFrameId: topFrameId, expression: "f()"}).then(evaluatedFirst);
+}
+
+function evaluatedFirst(response)
+{
+  InspectorTest.log("f() returns " + response.result.result.value);
+  Protocol.Debugger.evaluateOnCallFrame({ callFrameId: topFrameId, expression: "g()"}).then(evaluatedSecond);
+}
+
+function evaluatedSecond(response)
+{
+  InspectorTest.log("g() returns " + response.result.result.value);
+  Protocol.Debugger.evaluateOnCallFrame({ callFrameId: topFrameId, expression: "f()", throwOnSideEffect: true}).then(evaluatedThird);
+}
+
+function evaluatedThird(response)
+{
+  InspectorTest.log("f() returns " + response.result.result.value);
+  Protocol.Debugger.evaluateOnCallFrame({ callFrameId: topFrameId, expression: "g()", throwOnSideEffect: true}).then(evaluatedFourth);
+  InspectorTest.completeTest();
+}
+
+function evaluatedFourth(response)
+{
+  InspectorTest.log("g() throws " + response.result.result.className);
+  InspectorTest.completeTest();
+}