Minor updates to IDL to match changes in PPAPI headers.

This another round of minor changes in the IDL to bring it up to date
with the checked in PPAPI 'C' headers.  WRT testing, the CL needed
to drive the test is still in flight.

TEST= python idl_c_header.py --wcomment --srcroot=../api --dstroot=hdir ../api/*.idl
BUG= http://code.google.com/p/chromium/issues/detail?id=76271
Review URL: http://codereview.chromium.org/7204019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89684 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ppapi/api/ppb_core.idl b/ppapi/api/ppb_core.idl
index 50ca87a..e28fb0a 100644
--- a/ppapi/api/ppb_core.idl
+++ b/ppapi/api/ppb_core.idl
@@ -5,7 +5,10 @@
 
 /* Defines the core API. */
 
-/* {PENDING: describe PPB_CORE} */
+/*
+ * The PPB_Core interface contains pointers to functions related to memory
+ * management, time, and threads on the browser.
+ */
 interface PPB_Core_0_3 {
   /* Same as AddRefVar for Resources. */
   void AddRefResource(