Re-land of Use parenthesis in descriptions for array/map/set lengths/sizes

test/inspector/runtime/length-or-size-description.js

Index: test/inspector/runtime/length-or-size-description.js
diff --git a/test/inspector/runtime/length-or-size-description.js b/test/inspector/runtime/length-or-size-description.js
new file mode 100644
index 0000000000000000000000000000000000000000..d7200f2cb8adb5abc2d439a56f4bfbff4c1fd003
--- /dev/null
+++ b/test/inspector/runtime/length-or-size-description.js
@@ -0,0 +1,22 @@
+// 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 descriptions for arrays, maps, and sets include the correct length or size.")
+
+testExpression("new Set()")

[kozy, 2016/11/23 18:49:10]

V8 run microtasks in the scheduled first - run first order we can try to replace
this code with following.
Promise.all([
    testExpression("new Set()"),
    testExpression("new Set([1,2])")),
    testExpression("new Map()")),
    testExpression("new Map([[1,2],[3,4]])")),
    testExpression("new Array()")),
    testExpression("new Array(2)")),
    testExpression("new Uint8Array()")),
    testExpression("new Uint8Array(2)"))
]).then(() => InspectorTest.completeTest());

[luoe, 2016/11/23 19:23:31]

Done.

+    .then(() => testExpression("new Set([1,2])"))
+    .then(() => testExpression("new Map()"))
+    .then(() => testExpression("new Map([[1,2],[3,4]])"))
+    .then(() => testExpression("new Array()"))
+    .then(() => testExpression("new Array(2)"))
+    .then(() => testExpression("new Uint8Array()"))
+    .then(() => testExpression("new Uint8Array(2)"))
+    .then(() => InspectorTest.completeTest());
+
+function testExpression(expression) {
+  return Protocol.Runtime.evaluate({ expression: expression })
+            .then(result => InspectorTest.logMessage(result.result.result.description))
+            .then(() => Protocol.Runtime.evaluate({ expression: "[" + expression + "]", generatePreview: true }))
+            .then(result => InspectorTest.logMessage(result.result.result.preview.properties[0].value))
+}