Run pixel tests via automated script.

Run pixel tests via automated script.

On origin/master, we only have .ppm format support, so the
expected output files would take up a lot of space. Hence,
this may not get going until XFA hits with its .png
support.

Nor is there a good way to diff these; XFA provides this
for .png as well.

But this will provide at least one automated test to ensure
that we've got non-blank output, at least for one trivially
simple case.

R=thestig@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/7435e8e5c2f1163ec5eca79a3ac6c3920d490578

[Tom Sepez, 2015-02-13 22:44:18]

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

[Tom Sepez, 2015-02-13 22:44:19]

For completeness.

[Lei Zhang, 2015-02-13 23:09:04]

lgtm

This assumes the tests are just a single page, right?

There's a typo in the commit message: "ouput"

[Tom Sepez, 2015-02-14 00:16:34]

On 2015/02/13 23:09:04, Lei Zhang wrote:
> lgtm
> 
> This assumes the tests are just a single page, right?
Ah, good point.  It should look for all N pages.

[Tom Sepez, 2015-02-14 00:32:43]

New patchsets have been uploaded after l-g-t-m from thestig@chromium.org

[Tom Sepez, 2015-02-14 00:34:51]

Ok, lets try again, I also fixed an issue with the root directory not always
being "pdfium" that's still waiting in another CL.

[Lei Zhang, 2015-02-14 00:39:44]

https://codereview.chromium.org/926173002/diff/20001/testing/tools/run_pixel_...
File testing/tools/run_pixel_tests.py (right):

https://codereview.chromium.org/926173002/diff/20001/testing/tools/run_pixel_...
testing/tools/run_pixel_tests.py:23: actual_path_template =
os.path.join(working_dir, input_root + '.pdf.%s.ppm')
Shouldn't that be %d ? I think it works with %s because there's some implicit
int -> string conversion.

[Tom Sepez, 2015-02-14 00:44:50]

https://codereview.chromium.org/926173002/diff/20001/testing/tools/run_pixel_...
File testing/tools/run_pixel_tests.py (right):

https://codereview.chromium.org/926173002/diff/20001/testing/tools/run_pixel_...
testing/tools/run_pixel_tests.py:23: actual_path_template =
os.path.join(working_dir, input_root + '.pdf.%s.ppm')
On 2015/02/14 00:39:43, Lei Zhang wrote:
> Shouldn't that be %d ? I think it works with %s because there's some implicit
> int -> string conversion.

Done.

[Lei Zhang, 2015-02-14 00:46:16]

lgtm++

[Tom Sepez, 2015-02-14 00:47:26]

Committed patchset #3 (id:40001) manually as
7435e8e5c2f1163ec5eca79a3ac6c3920d490578 (presubmit successful).