commit 81b17e069328d70e1008c958251ff1ddfed5b4f8
author morrita <morrita@chromium.org> Fri Feb 06 00:58:30 2015
committer Commit bot <commit-bot@chromium.org> Fri Feb 06 00:59:23 2015
tree eae257ea107ece0a0f050f20eaeb66ff72caa79b
parent 616a8e656b2d923ed393bde86adc150e555ba799

IPC: Add MojoHandleAttachment

This CL introduces MojoHandleAttachment, a MessageAttachment subclass.
With this and ChannelMojo, we are able to send Mojo MessagePipes
over IPC.

There is also MojoMessageHelper which provides some static member functions
that reads and writes MessagePipes from/to a Message. In coming changes,
we'll add ParamTraits for MessagePipe based on this.

R=agl@chromium.org, viettrungluu@chromium.org
TEST=IPCChannelMojoTest.SendMessagePipe, IPCChannelMojoTest.SendPlatformHandleAndPipe
BUG=448190

Review URL: https://codereview.chromium.org/866223005

Cr-Commit-Position: refs/heads/master@{#314930}