[Webkit-unassigned] [Bug 226641] New: CountQueuingStrategy.constructor misses checking if the init.highWaterMark is exist or not

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226641

            Bug ID: 226641
           Summary: CountQueuingStrategy.constructor misses checking if
                    the init.highWaterMark is exist or not
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zyscoder at gmail.com
                CC: bugs-noreply at webkitgtk.org

Steps to reproduce:

(1) Open a tab and navigate to any URL;
(2) Run one of the following codes in the Console of Devtools:
```
new CountQueuingStrategy({highWaterMark:undefined}) / new CountQueuingStrategy({})
```
(3) Then this code would be evaluated successfully without throwing any exception.

Actual results:

This code is evaluated successfully without throwing any exception.

Expected results:

As the spec(https://streams.spec.whatwg.org/#dictdef-queuingstrategyinit) says, CountQueuingStrategy.constructor asks a double value as its init.highWaterMark param. Thus these codes should throw an exception.

In my test, both Chrome and Firefox throw exceptions:
Chrome: `VM1491:1 Uncaught TypeError: Failed to construct 'CountQueuingStrategy': required member highWaterMark is undefined.`
Firefox: `Uncaught TypeError: 'highWaterMark' must not be undefined`

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