Fix font rendering on Linux

[debloper]

Certain Linux systems are failing to display any text-contents on the test-pages.
Tested with Fedora 18, on KDE 4.10.x

[metajack]

This is fixed the skia and rust-azure pull requests currently waiting for review.

[metajack]

This is fixed on master now. Please reopen if you continue to have trouble.

[mcepl]

So, when I get this, should I ask for reopening this issue or is this #315 ?

matej@wycliff: build (master *)$ ./servo ../src/test/about-mozilla.html
rust: task failed at 'assertion failed: fonts.len() > 0', /home/matej/repos/tmp/servo/src/servo-gfx/font_context.rs:131
rust: task failed at 'connection closed', /home/matej/repos/tmp/servo/src/rust/src/libcore/option.rs:429
rust: task failed at 'option::get none', /home/matej/repos/tmp/servo/src/rust/src/libcore/option.rs:453
rust: task failed at 'killed', /home/matej/repos/tmp/servo/src/rust/src/libcore/pipes.rs:275
rust: task failed at 'killed', /home/matej/repos/tmp/servo/src/rust/src/libcore/pipes.rs:275
rust: task failed at 'killed', /home/matej/repos/tmp/servo/src/rust/src/libcore/pipes.rs:275
rust: task failed at 'killed', /home/matej/repos/tmp/servo/src/rust/src/libcore/pipes.rs:275
rust: domain main @0x7ff7f8203600 root task failed
rust: task failed at 'killed', /home/matej/repos/tmp/servo/src/rust/src/libcore/pipes.rs:275
rust: task failed at 'killed', /home/matej/repos/tmp/servo/src/rust/src/libcore/pipes.rs:275
rust: task failed at 'killed', /home/matej/repos/tmp/servo/src/rust/src/libcore/pipes.rs:275
terminate called after throwing an instance of 'rust_task*'
Redirecting call to abort() to mozalloc_abort

Segmentation fault (core dumped)

[metajack]

I believe this is font fallback failing. If you had a font installed it could use, then this would work.

This is probably this bug: #410

#315 I think the font rendering was crazy, not segfaulting. Installing msttcorefonts would probably fix this for you as a workaround.

[mcepl]

Yes, installing msttcorefonts (oh those memories, last time I have installed it was six years ago ;)) helped to ../src/test/about-mozilla.html. ./servo http://www.google.com provided very shaky 302 redirection message.