Merge changes I403ffbf7,I62891082,Iac185d3a,I2b78a7b8

* changes:
  cronet import: add test dependencies that were imported in aosp/2399270
  cronet import: use folder.origin instead of git.origin
  cronet import: use public chromium repository as a source
  cronet import: add --git-origin-checkout-hook to run gclient