Enable shared memory for field trials

This turns on the flag for using shared memory to share field trials between processes. For more context, see:

The design document: go/share-field-trials

Related previous CLs:
https://codereview.chromium.org/2517193003/
https://codereview.chromium.org/2511413002/
https://codereview.chromium.org/2490513004/
https://codereview.chromium.org/2490513004/
https://codereview.chromium.org/2365273004/
https://codereview.chromium.org/2412113002/
https://codereview.chromium.org/2449143002/
https://codereview.chromium.org/2453093002/
https://codereview.chromium.org/2449783007/
https://codereview.chromium.org/2456723004/
https://codereview.chromium.org/2453933004/

BUG=131632

Review-Url: https://codereview.chromium.org/2527643002
Cr-Commit-Position: refs/heads/master@{#434217}


CrOS-Libchrome-Original-Commit: db8a9220deabed531200e613a53d4fe6d87136d5
1 file changed
tree: 07d76c53e5d2b33c067ed227a9f7bbf587dbb7ee
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/