Out of process Pepper

Implement a new process type for running PPAPI plugins. The process itself is
quite simple and just sets up the PPAPI dispatcher and loads the library.

There is a new command line switch --ppapi-out-of-process which runs PPAPI
plugins out of process using the new code path. There is some logic in
RenderView and PepperPluginModule for setting up this connection, but it should
be straightforward.

TEST=none
BUG=none

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=65614

[jam, 2010-11-04 21:57:25]

don't you also need to update sandbox_policy.cc' StartProcessWithAccess() so
that the process is sandboxed?

http://codereview.chromium.org/3915002/diff/106001/107005
File chrome/browser/ppapi_plugin_process_host.cc (right):

http://codereview.chromium.org/3915002/diff/106001/107005#newcode58
chrome/browser/ppapi_plugin_process_host.cc:58: false,  // Never use the zygote
(GPU plugin can't be sandboxed).
update this comment

also, why no zygote?

http://codereview.chromium.org/3915002/diff/106001/107006
File chrome/browser/ppapi_plugin_process_host.h (right):

http://codereview.chromium.org/3915002/diff/106001/107006#newcode27
chrome/browser/ppapi_plugin_process_host.h:27: 
nit: extra line

http://codereview.chromium.org/3915002/diff/106001/107009
File chrome/browser/renderer_host/resource_message_filter.h (right):

http://codereview.chromium.org/3915002/diff/106001/107009#newcode481
chrome/browser/renderer_host/resource_message_filter.h:481: std::vector<
linked_ptr<PpapiPluginProcessHost> > ppapi_plugin_hosts_;
nit: no need for first space?

http://codereview.chromium.org/3915002/diff/106001/107016
File chrome/common/pepper_plugin_registry.cc (right):

http://codereview.chromium.org/3915002/diff/106001/107016#newcode219
chrome/common/pepper_plugin_registry.cc:219: 
nit: extra line

[brettw, 2010-11-07 22:04:55]

New snap up with comments addressed.

[jam, 2010-11-08 06:30:53]

lgtm