Fix building pdfium for x64 with ninja under windows.

Fix building pdfium for x64 with ninja under windows.

This adds the necessary directives to the standalone gyp file.

R=jschuh@chromium.org, jam@chromium.org
BUG=pdfium:22
Patch from Michael Doppler <m.doppler@gmail.com>;.

Committed: https://pdfium.googlesource.com/pdfium/+/c7cd3c8

[mdoppler, 2014-07-01 11:39:46]

This fixes pdfium issue 22:

https://code.google.com/p/pdfium/issues/detail?id=22

[jschuh, 2014-07-02 17:21:11]

lgtm

[Nico, 2014-07-16 22:50:58]

Did anyone land this?

[mdoppler, 2014-07-17 06:17:50]

On 2014/07/16 22:50:58, Nico (away) wrote:
> Did anyone land this?

I don't think so,  should I ask one of the pdfium devs to land it?

[Nico, 2014-07-17 16:02:24]

Committed patchset #1 manually as rc7cd3c8 (presubmit successful).

[Nico, 2014-07-17 16:03:44]

On 2014/07/17 06:17:50, mdoppler wrote:
> On 2014/07/16 22:50:58, Nico (away) wrote:
> > Did anyone land this?
> 
> I don't think so,  should I ask one of the pdfium devs to land it?

I just committed it for you. Unless you say "Please land" somewhere, your
reviewer might not expect you to expect them to land your patches and they might
be forgotten – so if your patch doesn't get landed within a day of getting an
lgtm, it's best to ping.

Thanks for the patch!

[mdoppler, 2014-07-17 16:24:35]

On 2014/07/17 16:03:44, Nico (away) wrote:
> On 2014/07/17 06:17:50, mdoppler wrote:
> > On 2014/07/16 22:50:58, Nico (away) wrote:
> > > Did anyone land this?
> > 
> > I don't think so,  should I ask one of the pdfium devs to land it?
> 
> I just committed it for you. Unless you say "Please land" somewhere, your
> reviewer might not expect you to expect them to land your patches and they
might
> be forgotten – so if your patch doesn't get landed within a day of getting an
> lgtm, it's best to ping.
> 
> Thanks for the patch!

I see, thanks for landing it!