Intercept CreateThread inside renderer and proxy out to CreateRemoteThread in browser.
summary:
* Create new interception
* Create new IPC (IPC_CREATETHREAD_TAG)
* new tests in process_policy_test.cc
* Interception is installed, but passes call through by default. Proxy is only done for tests, when ALPC ports are closed.
Note: the IPC uses VOIDPTR_TYPE for a size_t param. These are not guaranteed to be the same (http://stackoverflow.com/questions/1464174/size-t-vs-intptr-t). Should we create a size_t IPC type?
BUG=464430
Review URL: https://codereview.chromium.org/1225183003
Cr-Commit-Position: refs/heads/master@{#374510}
18 files changed
