Re-land second sandbox round of changes...

sandbox/src/sharedmem_ipc_server.cc

Index: sandbox/src/sharedmem_ipc_server.cc
===================================================================
--- sandbox/src/sharedmem_ipc_server.cc	(revision 41493)
+++ sandbox/src/sharedmem_ipc_server.cc	(working copy)
@@ -171,7 +171,7 @@
           break;
         }
         case ULONG_TYPE: {
-          ULONG data;
+          uint32 data;
           if (!params->GetParameter32(i, &data)) {
             ReleaseArgs(ipc_params, args);
             return false;
@@ -180,6 +180,15 @@
           args[i] = ipc_int.AsVoidPtr();
           break;
         }
+        case VOIDPTR_TYPE : {
+          void* data;
+          if (!params->GetParameterVoidPtr(i, &data)) {
+            ReleaseArgs(ipc_params, args);
+            return false;
+          }
+          args[i] = data;
+          break;
+        }
         case INOUTPTR_TYPE: {
           if (!args[i]) {
             ReleaseArgs(ipc_params, args);