Simplify mojo_base shared memory region support

Changes the SharedMemoryRegion types in mojo_base mojom to use a
handle<shared_buffer> as their internal representation. This simplifies
the traits and makes these region types usable in Java and JS.

Bug: 826213
Change-Id: Id515f61f34b85c655b70d45d53302e873547a83a
Reviewed-on: https://chromium-review.googlesource.com/1059008
Commit-Queue: Ken Rockot <rockot@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559207}

CrOS-Libchrome-Original-Commit: ca7ae9dd61c89912b01ae313d8486e3ebc96a0fb
4 files changed
tree: 1319745ab11a6b7a3fc056454f3707c3d7ebc215
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/