Update README to use GN instead of GYP

Update README to use GN instead of GYP

This Cl updates the README so GN is the recommended method to build PDFium in
a standalone fashion.

BUG=pdfium:485
Committed: https://pdfium.googlesource.com/pdfium/+/ab522f9e05291d6d915a40174e3cb5f7509c449b

[dsinclair, 2016-05-04 17:28:27]

dsinclair@chromium.org changed reviewers:
+ thestig@chromium.org, tsepez@chromium.org

[dsinclair, 2016-05-04 17:28:28]

PTAL.

[Tom Sepez, 2016-05-04 17:34:07]

https://codereview.chromium.org/1950103002/diff/1/README.md
File README.md (right):

https://codereview.chromium.org/1950103002/diff/1/README.md#newcode10
README.md:10: 
Add a news item for GN change.  I think a 90 day lifespan for "news" is
reasonalbe, so aging out the XFA branch blurb is fine.  And
maybe reverse chrono order, so that the GN change blurb goes first.

https://codereview.chromium.org/1950103002/diff/1/README.md#newcode99
README.md:99: 
Add section about how to set an arg with an example.  It would be great if we
didn't have to go to the GN docs.

[dsinclair, 2016-05-04 17:38:50]

https://codereview.chromium.org/1950103002/diff/1/README.md
File README.md (right):

https://codereview.chromium.org/1950103002/diff/1/README.md#newcode10
README.md:10: 
On 2016/05/04 17:34:07, Tom Sepez wrote:
> Add a news item for GN change.  I think a 90 day lifespan for "news" is
> reasonalbe, so aging out the XFA branch blurb is fine.  And
> maybe reverse chrono order, so that the GN change blurb goes first.

Done. Also added a bit for when GYP will go away.

https://codereview.chromium.org/1950103002/diff/1/README.md#newcode99
README.md:99: 
On 2016/05/04 17:34:07, Tom Sepez wrote:
> Add section about how to set an arg with an example.  It would be great if we
> didn't have to go to the GN docs.

Better? The above is how you set the args, wrote some better words around it to
hopefully clarify.

[Tom Sepez, 2016-05-04 18:00:27]

lgtm

https://codereview.chromium.org/1950103002/diff/40001/README.md
File README.md (right):

https://codereview.chromium.org/1950103002/diff/40001/README.md#newcode5
README.md:5: As of 2016-05-04, GN is used to generate build files replacing GYP.
GYP is
nit: extra "is" at end of line.

https://codereview.chromium.org/1950103002/diff/40001/README.md#newcode7
README.md:7: in PDFium.
nit: removed from.

[dsinclair, 2016-05-04 18:10:49]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2016-05-04 18:10:50]

The patchset sent to the CQ was uploaded after l-g-t-m from tsepez@chromium.org
Link to the patchset: https://codereview.chromium.org/1950103002/#ps60001
(title: " ")

[commit-bot: I haz the power, 2016-05-04 18:10:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1950103002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1950103002/60001

[dsinclair, 2016-05-04 18:11:10]

https://codereview.chromium.org/1950103002/diff/40001/README.md
File README.md (right):

https://codereview.chromium.org/1950103002/diff/40001/README.md#newcode5
README.md:5: As of 2016-05-04, GN is used to generate build files replacing GYP.
GYP is
On 2016/05/04 18:00:26, Tom Sepez wrote:
> nit: extra "is" at end of line.

Done.

https://codereview.chromium.org/1950103002/diff/40001/README.md#newcode7
README.md:7: in PDFium.
On 2016/05/04 18:00:26, Tom Sepez wrote:
> nit: removed from.

Done.

[commit-bot: I haz the power, 2016-05-04 18:23:55]

Description was changed from

==========
Update README to use GN instead of GYP

This Cl updates the README so GN is the recommended method to build PDFium in
a standalone fashion.

BUG=pdfium:485
==========

to

==========
Update README to use GN instead of GYP

This Cl updates the README so GN is the recommended method to build PDFium in
a standalone fashion.

BUG=pdfium:485

Committed:
https://pdfium.googlesource.com/pdfium/+/ab522f9e05291d6d915a40174e3cb5f7509c...
==========

[commit-bot: I haz the power, 2016-05-04 18:23:56]

Committed patchset #4 (id:60001) as
https://pdfium.googlesource.com/pdfium/+/ab522f9e05291d6d915a40174e3cb5f7509c...