PNaCl Dynamic Linking: Added portable dependencies to shared objects.

tests/pnacl_dynamic_loading/pll_loader_test.cc

Index: tests/pnacl_dynamic_loading/pll_loader_test.cc
diff --git a/tests/pnacl_dynamic_loading/pll_loader_test.cc b/tests/pnacl_dynamic_loading/pll_loader_test.cc
index e2a657e855a1c01ea8b8a33dfa18ece6c9a9e791..7903076fdd5e0495bd703de0886075015679f68e 100644
--- a/tests/pnacl_dynamic_loading/pll_loader_test.cc
+++ b/tests/pnacl_dynamic_loading/pll_loader_test.cc
@@ -57,17 +57,20 @@ int main(int argc, char **argv) {
   int *module_a_var = (int *) modset.GetSym("module_a_var");
   ASSERT_EQ(module_a_var, NULL);
 
-  modset.AddBySoname(module_a_soname);
+  ASSERT_NE(modset.AddBySoname(module_a_soname), NULL);
   module_a_var = (int *) modset.GetSym("module_a_var");
   ASSERT_NE(module_a_var, NULL);
   ASSERT_EQ(*module_a_var, 2345);
 
-  modset.AddBySoname(module_b_soname);
+  // Demonstrate that the same soname cannot be loaded multiple times.
+  ASSERT_EQ(modset.AddBySoname(module_a_soname), NULL);
+
+  ASSERT_NE(modset.AddBySoname(module_b_soname), NULL);
   int *module_b_var = (int *) modset.GetSym("module_b_var");
   ASSERT_NE(module_b_var, NULL);
   ASSERT_EQ(*module_b_var, 1234);
 
-  modset.AddBySoname(module_tls_soname);
+  ASSERT_NE(modset.AddBySoname(module_tls_soname), NULL);
 
   modset.ResolveRefs();