[XHR] Fix a XHR-stream test script.

[XHR] Fix a XHR-stream test script.

slow-failure.cgi is a cgi script that outputs a chunked-encoding error after
waiting a few seconds. When connected with XHR, it was expected that the XHR
instance gets LOADING and then get an error. However, with the current script,
it will stay OPEN before getting the error.

This CL fixes the script so that the XHR instance starts loading before getting
errored.

BUG=480746
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197349

[yhirano, 2015-06-15 08:47:55]

yhirano@chromium.org changed reviewers:
+ hiroshige@chromium.org

[yhirano, 2015-06-15 08:47:55]

This CL is needed for https://codereview.chromium.org/1181573003/.

[hiroshige, 2015-06-18 08:49:29]

https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
File LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi (right):

https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi:8: 
Please add comments describing expected behavior ("the XHR instance gets LOADING
and then get an error"), and how this expected behavior is achieved by this
script, somewhere in the script.

https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi:10: print
"X-Content-Type-Options: nosniff\n";
How "X-Content-Type-Options: nosniff" header works in the context of this CL?
I think Line 13 is to make loading start by outputting something not causing
errors, but not sure about this nosniff line.

[yhirano, 2015-06-18 11:18:08]

https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
File LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi (right):

https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi:8: 
On 2015/06/18 08:49:28, hiroshige wrote:
> Please add comments describing expected behavior ("the XHR instance gets
LOADING
> and then get an error"), and how this expected behavior is achieved by this
> script, somewhere in the script.

Done.

https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi:10: print
"X-Content-Type-Options: nosniff\n";
On 2015/06/18 08:49:28, hiroshige wrote:
> How "X-Content-Type-Options: nosniff" header works in the context of this CL?
> I think Line 13 is to make loading start by outputting something not causing
> errors, but not sure about this nosniff line.

I add this option just in case, because Chrome may buffer bytes to sniff a mime
type without this option though I do not completely understand the mechanism.
See https://code.google.com/p/chromium/issues/detail?id=2016 for example.

[hiroshige, 2015-06-18 11:33:30]

On 2015/06/18 11:18:08, yhirano wrote:
>
https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
> File LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi (right):
> 
>
https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
> LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi:8: 
> On 2015/06/18 08:49:28, hiroshige wrote:
> > Please add comments describing expected behavior ("the XHR instance gets
> LOADING
> > and then get an error"), and how this expected behavior is achieved by this
> > script, somewhere in the script.
> 
> Done.
> 
>
https://codereview.chromium.org/1181973005/diff/1/LayoutTests/http/tests/xmlh...
> LayoutTests/http/tests/xmlhttprequest/resources/slow-failure.cgi:10: print
> "X-Content-Type-Options: nosniff\n";
> On 2015/06/18 08:49:28, hiroshige wrote:
> > How "X-Content-Type-Options: nosniff" header works in the context of this
CL?
> > I think Line 13 is to make loading start by outputting something not causing
> > errors, but not sure about this nosniff line.
> 
> I add this option just in case, because Chrome may buffer bytes to sniff a
mime
> type without this option though I do not completely understand the mechanism.
> See https://code.google.com/p/chromium/issues/detail?id=2016 for example.

lgtm.

[yhirano, 2015-06-18 11:34:40]

The CQ bit was checked by yhirano@chromium.org

[commit-bot: I haz the power, 2015-06-18 11:35:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1181973005/40001

[commit-bot: I haz the power, 2015-06-18 12:37:02]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197349