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The dri drivers path is the variable 'dridriverdir' in 'dri.pc'

If found then translate it to the macro DRI_DRIVER_DIR.

It can be useful in various places instead of guessing the path.
For now only use it in gpu_sandbox_hook_linux except for ChromeOS.

Bug: 787787
Change-Id: I7fef8606a4f2cbc04233af820a91cf12a4c7a9a5
Reviewed-on: https://chromium-review.googlesource.com/785371Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Julien Isorce <julien.isorce@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519658}