Add a way to implement GetInterface in the broker.

Add a way to implement GetInterface in the broker.

This also adds some cleanup in the Pepper API to provide typedefs for the three PPP_* functions. I removed some ad-hoc typedefes we had floating around and replaced them with these more "official" ones.

BUG=
TEST=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=132285

[viettrungluu, 2012-04-12 22:14:07]

LGTM w/nits.

https://chromiumcodereview.appspot.com/10069035/diff/1/ppapi/c/ppp.h
File ppapi/c/ppp.h (right):

https://chromiumcodereview.appspot.com/10069035/diff/1/ppapi/c/ppp.h#newcode142
ppapi/c/ppp.h:142: PPB_GetInterface get_interface);
Nit: Should you call this |get_browser_interface| to be consistent with the
declaration of |PPP_InitializeModule()|?

https://chromiumcodereview.appspot.com/10069035/diff/1/ppapi/c/ppp.h#newcode145
ppapi/c/ppp.h:145: * Defines the type of the <code>PPP_ShutdownModule</code>
function.
PPP_GetInterface

https://chromiumcodereview.appspot.com/10069035/diff/1/ppapi/c/ppp.h#newcode147
ppapi/c/ppp.h:147: typedef const void* (*PP_GetInterface_Func)(const char*
interface_name);
Nit: Keep the same order as the PPP_... declarations (initialize, shutdown, get
iface)?

https://chromiumcodereview.appspot.com/10069035/diff/1/ppapi/cpp/ppp_entrypoi...
File ppapi/cpp/ppp_entrypoints.cc (right):

https://chromiumcodereview.appspot.com/10069035/diff/1/ppapi/cpp/ppp_entrypoi...
ppapi/cpp/ppp_entrypoints.cc:54: if (!g_module_singleton) {
Nit: Maybe it'd be nicer to write this function as:

if (g_module_singleton)
  return ...;
if (g_broker_get_interface)
  return ...;
return NULL;