Sandbox html_viewer on Linux.

This creates a font_service which does the same role as
font_config_ipc_linux.cc does in content/. This lets us sandbox the
html_viewer, while still being able to communicate with fontconfig.

Also prewarms the ICU timezone data, along with doing all the
prewarming that's done in the core_services sandbox.

BUG=492524
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1274743004

Cr-Commit-Position: refs/heads/master@{#342281}


CrOS-Libchrome-Original-Commit: 4196dfefc131b0a77a3e02e917b852dba8faf445
3 files changed
tree: 701d5b09c92e77354b2c5ede73ee79d87e0a2b39
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/