This patch enables the auto raw pointer deduction on linux. The plan
is to also enable this on all the remaining platforms shortly.

R=thakis@chromium.org, danakj@chromium.org
BUG=554600
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2697873004
Cr-Commit-Position: refs/heads/master@{#452973}