Use reentrant lock for main dictionaries. DO NOT MERGE

cherrypick of Iaa9b79fc770d8ae2ec9d7c362c90c28bc9f65ea8

Bug: 10964805
Change-Id: Id5e67b00bf9594be0591c87407a78146297e0e78
2 files changed
tree: f38019f4e9fb0e478f107b093249ed82d5a50f80
  1. dictionaries/
  2. java/
  3. native/
  4. tests/
  5. tools/
  6. Android.mk
  7. CleanSpec.mk