[inspector] test Runtime.getProperties for set and map [[Entries]]

Added a test that Runtime.getProperties doesn't truncate Set and Map properties in [[Entries]] in internalProperties.

BUG=chromium:650729
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2376863002
Cr-Commit-Position: refs/heads/master@{#39940}

test/inspector/runtime/set-or-map-entries-expected.txt

+Test that Runtime.getProperties doesn't truncate set and map entries in internalProperties.
+Entries for "createSet(10)"
+Array[10]
+Entries for "createSet(1000)"
+Array[1000]
+Entries for "createMap(10)"
+Array[10]
+Entries for "createMap(1000)"
+Array[1000]

test/inspector/runtime/set-or-map-entries.js

+// Copyright 2016 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.
+
+print("Test that Runtime.getProperties doesn't truncate set and map entries in internalProperties.")
+
+InspectorTest.evaluateInPage(`
+  function createSet(size) {
+    var s = new Set();
+    var a = {};
+    a.a = a;
+    for (var i = 0; i < size; ++i) s.add({ wrapper: a});
+    return s;
+  }
+
+  function createMap(size) {
+    var m = new Map();
+    var a = {};
+    a.a = a;
+    for (var i = 0; i < size; ++i) m.set(i, { wrapper: a});
+    return m;
+  }
+`);
+
+InspectorTest.sendCommand("Debugger.enable");
+InspectorTest.sendCommand("Runtime.enable");
+
+testExpression("createSet(10)")
+  .then(() => testExpression("createSet(1000)"))
+  .then(() => testExpression("createMap(10)"))
+  .then(() => testExpression("createMap(1000)"))
+  .then(() => InspectorTest.completeTest());
+
+function testExpression(expression)
+{
+  return InspectorTest.sendCommandPromise("Runtime.evaluate", { "expression": expression})
+           .then(result => InspectorTest.sendCommandPromise("Runtime.getProperties", { ownProperties: true, objectId: result.result.result.objectId }))
+           .then(message => dumpEntriesDescription(expression, message));
+}
+
+function dumpEntriesDescription(expression, message)
+{
+  InspectorTest.log(`Entries for "${expression}"`);
+  var properties = message.result.internalProperties;
+  var property;
+  if (properties)
+    property = properties.find(property => property.name === "[[Entries]]");
+  if (!property)
+    InspectorTest.log("[[Entries]] not found");
+  else
+    InspectorTest.log(property.value.description);
+}