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Originally, I tried to make the JavaScript bindings for the core Mojo APIs a
literal translation of the C APIs, but that makes MojoReadMessage a bit awkward
because C needs to worry much more about buffer allocation than JavaScript. In
building towards using the hello_world_service, I found that it was much easier
to push the MojoReadMessage pattern from connector.cc into C++ and make the
JavaScript API a bit more idiomatic by just returning an ArrayBuffer for the
message and an Array of handles.

BUG=317398

Review URL: https://codereview.chromium.org/83143002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236999 0039d316-1c4b-4281-b951-d872f2087c98