Change the JS app.viewerType() return value to "pdfium"

Change the JS app.viewerType() return value to "pdfium"

BUG=pdfium:181
R=tsepez@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/4bc64cabc561d5df211ed02dc75c85e41fa91312

[Lei Zhang, 2015-09-08 21:45:06]

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

[Lei Zhang, 2015-09-08 21:45:06]

Let me know if we need this separate test file or if we should just add the test
to an existing file.

[Tom Sepez, 2015-09-08 21:48:43]

On 2015/09/08 21:45:06, Lei Zhang wrote:
> Let me know if we need this separate test file or if we should just add the
test
> to an existing file.

app_alert() is so fundamental to testing everything else, that it got its own
file.
I'd expect that there'd be two other files: app_props.in and app_methods.in,
which 
parallel the structure of documnet_props.in and document_methods.in.

[Tom Sepez, 2015-09-08 21:48:44]

On 2015/09/08 21:45:06, Lei Zhang wrote:
> Let me know if we need this separate test file or if we should just add the
test
> to an existing file.

app_alert() is so fundamental to testing everything else, that it got its own
file.
I'd expect that there'd be two other files: app_props.in and app_methods.in,
which 
parallel the structure of documnet_props.in and document_methods.in.

[Tom Sepez, 2015-09-08 21:50:50]

Otherwise LGTM.

[Lei Zhang, 2015-09-08 22:17:47]

app_props.in it is

[Lei Zhang, 2015-09-08 22:17:57]

Committed patchset #2 (id:20001) manually as
4bc64cabc561d5df211ed02dc75c85e41fa91312 (presubmit successful).