Add ipc_channel_nacl to the untrusted build and fix all compile/link errors.

ipc/ipc_channel.cc

Index: ipc/ipc_channel.cc
===================================================================
--- ipc/ipc_channel.cc	(revision 132566)
+++ ipc/ipc_channel.cc	(working copy)
@@ -30,8 +30,14 @@
   // component. The strong random component prevents other processes from
   // hijacking or squatting on predictable channel names.
 
+  int process_id;
+#if !defined(OS_NACL)
+  process_id = base::GetCurrentProcId();
+#else
+  process_id = 0;
+#endif
   return base::StringPrintf("%d.%u.%d",
-      base::GetCurrentProcId(),

[dmichael (off chromium), 2012/04/23 14:51:11]

Would it be simpler to give base::GetCurrentProcId a stub implementation?

[bbudge, 2012/04/23 17:46:09]

base/process_util.cc wouldn't build untrusted unless we commented out almost all
of it. Instead, I think it's better this way, as we can more easily see where
we're substituting '0' in case of problems.
On 2012/04/23 14:51:11, dmichael wrote:

+      process_id,
       g_last_id.GetNext(),
       base::RandInt(0, std::numeric_limits<int32>::max()));
 }