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This creates a mojo/edk directory which contains the "embedder developer
kit" aka the set of code needed to embed mojo code.

mojo/edk/embedder = code from mojo/embedder
mojo/edk/system = code from mojo/system
mojo/edk/test = code used to test the previous two, from mojo/common/test

mojo/edk/ can only depend on mojo/public/, base/ and itself.

R=viettrungluu@chromium.org
TBR=sky@chromium.org for file renames

Committed: https://chromium.googlesource.com/chromium/src/+/ee7ff197a98da4636f33bd713de784948b487bd4

Review URL: https://codereview.chromium.org/621153003

Cr-Commit-Position: refs/heads/master@{#297986}