Attach to extension host

[roblourens]

Not sure how this is different from attaching to a typical node process

[weinand]

@roblourens This is basically a launch followed by an attach. But the launch uses VS Code to launch an extension host via some special command line arguments. And the disconnectRequest needs special code to support reloading the extension host.

Please note, that for testing this VS Code needs to be modified so that it uses a version of node that supports CDP (instead of the node version that Electron uses). For that reason I do not think that this feature needs to be implemented before node v7 has arrived in Electron.

[roblourens]

Oh, good point. I'll move it to lowest priority

[roblourens]

Blocked? electron/electron#6634