Provide IPC mechanism for host-to-resource messaging

Provide IPC mechanism for host-to-resource messaging

BUG=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=164577

[victorhsieh, 2012-10-25 07:00:30]

Please kindly have a look.  My refactoring of video capture will also benefit
from this.

[Takashi Toyoshima, 2012-10-25 12:50:39]

Thank you for fixing this.
LGTM though I have one optional comment.

http://codereview.chromium.org/11267034/diff/11001/ppapi/proxy/dispatch_reply...
File ppapi/proxy/dispatch_reply_message.h (right):

http://codereview.chromium.org/11267034/diff/11001/ppapi/proxy/dispatch_reply...
ppapi/proxy/dispatch_reply_message.h:142: } \
msg_class::Read may fail if sender doesn't set arguments properly.
So, I feel adding "else { NOTREACHED(); }" is safer as my original
websocket_resource.cc did.

PPAPI_DISPATCH_HOST_RESOURCE_CALL returns PP_ERROR_FAILED at similar situations.

[victorhsieh, 2012-10-25 14:39:03]

I missed it.  Thanks for catching.

Brett, when this is ready, would you please submit for me?  Thanks.

[brettw, 2012-10-28 18:08:15]

lgtm

[commit-bot: I haz the power, 2012-10-28 18:08:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/victorhsieh@chromium.org/11267034/5008

[commit-bot: I haz the power, 2012-10-29 00:02:18]

Change committed as 164577