This makes Sky never call into the
Heap::init/shutdown methods and removes
most Heap:: and ThreadState:: calls throughout
the rest of Sky.
There is a *ton* more to remove after this.
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/678003003
This CL plumbs the data pipe from the network stack all the way to the parser
thread. We now drain the data pipe on the parser thread, which means network
bytes don't need to transit the main thread to reach the parser.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/664573004