Add OWNERS in frameworks/ex

* Owners are selected from top CL approvals or owners.
  They will be suggested to review/approve future CLs.
* OWNERS files are recognized by the new find-owners plugin, see .md files in
  https://gerrit.googlesource.com/plugins/find-owners/+/master/src/main/resources/Documentation/

Test: build/make/tools/checkowners.py -c -v OWNERS
Change-Id: Ice402f921c42db160065cf7b8f4bb2dff3717b28
2 files changed
tree: 96a040f1c141880202af7535462490c391f51127
  1. camera2/
  2. common/
  3. framesequence/
  4. photoviewer/
  5. widget/
  6. CleanSpec.mk
  7. OWNERS