Make pdfium_embeddertests link in debug component builds.

Make pdfium_embeddertests link in debug component builds.

Target v8 has:

          'direct_dependent_settings': {
            'defines': [
              'V8_SHARED',
              'USING_V8_SHARED',
            ],
          },

For this to work, targets using v8 headers have to depend on v8
directly, else the V8_EXPORT macro won't work. Add a direct
dependency on v8.

BUG=none
TEST=do a debug component build of pdfium_embeddertests on Win,
should work without linker errors

R=tsepez@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/6f34355e9d091fd4e031e9354fdfa778000b0d4a

[Nico, 2015-09-16 20:48:53]

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

[Nico, 2015-09-16 20:48:53]

I guess the most interesting bit here is that these tests didn't build (at least
on Windows) and you folks weren't aware of that. Can you make sure this gets
built on enough bots so that they can catch problems like this?

[Tom Sepez, 2015-09-16 20:52:59]

lgtm

[Nico, 2015-09-16 20:53:51]

Committed patchset #1 (id:1) manually as
6f34355e9d091fd4e031e9354fdfa778000b0d4a (presubmit successful).