In mojom, there's a notion of a request/response pair. This CL teaches the JS
bindings not to GC a message pipe after a request has been issued but before
the response has been received.
R=hansmuller@chromium.org
Review URL: https://codereview.chromium.org/696373003
Previously we were using string concatenation to build up the directory
listing. Now we fetch some JSON from the server and use data binding to inflate
a directory listing.
This exmaple doesn't work yet because we're missing support for
template@repeat, but hopefully we'll get that soon.
Also, added support for setRequestHeader to XMLHttpRequest.
R=rafaelw@chromium.org
Review URL: https://codereview.chromium.org/688413005
