SkPDF fix object counting error

SkPDF fix object counting error

Committed: https://skia.googlesource.com/skia/+/41f88f0251cf48eb06f3f8d143aac8562a230889

[hal canary at chromium, 2015-03-26 20:12:52]

halcanary@chromium.org changed reviewers:
+ halcanary@chromium.org

[hal canary at chromium, 2015-03-26 20:12:53]

lgtm

[hal canary at chromium, 2015-03-26 20:13:03]

The CQ bit was checked by halcanary@chromium.org

[commit-bot: I haz the power, 2015-03-26 20:13:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1012483003/1

[commit-bot: I haz the power, 2015-03-26 20:13:14]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-03-27 02:13 UTC

[mtklein, 2015-03-26 20:17:05]

mtklein@google.com changed reviewers:
+ mtklein@google.com

[mtklein, 2015-03-26 20:17:06]

How'd you catch this?  Is it possible to write a regression test?

[hal.canary, 2015-03-26 21:01:18]

On 2015/03/26 20:17:06, mtklein wrote:
> How'd you catch this?  Is it possible to write a regression test?

I happened to look at the code and thought "that's not right".  I didn't catch
it immediately because no pdf reader complained or misfunctioned.  `qpdf -check`
does see the error ("file is damaged... invalid xref entry").  I will begin
running qpdf-check as part of my local testing regime.

[mtklein, 2015-03-26 22:34:00]

sgtm / lgtm

[commit-bot: I haz the power, 2015-03-26 22:35:23]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/41f88f0251cf48eb06f3f8d143aac8562a230889