Add range insertion for base::flat_tree

This change implements an efficient algorithm for base::flat_tree::insert(Iter, Iter).

BUG=671759, 682249

Review-Url: https://codereview.chromium.org/2853333004
Cr-Commit-Position: refs/heads/master@{#473148}


CrOS-Libchrome-Original-Commit: 154dc49655238f0fc9928763bcf47930823a8e02
4 files changed
tree: 48e9beb7c7f4c9d12e9f351bb97b6b859d3cdb99
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/