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Adds mojom equivalents of {ReadOnly,Writable,Unsafe}SharedMemoryRegion.
These are typemapped to the new base types.

The typemap implementation is currently written by wrapping and
unwrapping generic platform handles rather than relying on Mojo's
shared buffer implementation.

Existing mojom shared buffer handle consumers will be converted to use
these types in place of raw handle<shared_buffer>. The (mojom) types
here will eventually wrap handle<shared_buffer> instead of raw platform
handles.

This is to ease the transition to new shared memory semantics while
also getting us something we want, i.e., stronger shared memory type
safety for common mojom uses.

Bug: 826213
Change-Id: Iba36758b70953492997e744eeecaf7b7403627fc
Reviewed-on: https://chromium-review.googlesource.com/982577Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547104}