Adding untrusted crash dump / stack trace tests.

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index 8199beb07d7f134541078427f5d73c1a6a56bf53..ba23b8f4dc6bf6cace1906904995115e8241c0d0 100755
--- a/SConstruct
+++ b/SConstruct
@@ -1605,14 +1605,15 @@ def PPAPIBrowserTester(env,
       continue
     stream_file = env.subst(params['file'])
     command.extend(['--nacl_exe_' + stream, stream_file])
-    golden_file = env.subst(params['golden'])
-    filter_regex = params.get('filter_regex', None)
-    filter_inverse = params.get('filter_inverse', False)
-    filter_group_only = params.get('filter_group_only', False)
-    post_actions.append(
-        GoldenFileCheckAction(
-            env, stream_file, golden_file,
-            filter_regex, filter_inverse, filter_group_only))
+    if 'golden' in params:
+      golden_file = env.subst(params['golden'])
+      filter_regex = params.get('filter_regex', None)
+      filter_inverse = params.get('filter_inverse', False)
+      filter_group_only = params.get('filter_group_only', False)
+      post_actions.append(
+          GoldenFileCheckAction(
+              env, stream_file, golden_file,
+              filter_regex, filter_inverse, filter_group_only))
 
   if ShouldUseVerboseOptions(extra):
     env.MakeVerboseExtraOptions(target, log_verbosity, extra)
@@ -3130,6 +3131,7 @@ nacl_env.Append(
     'src/trusted/service_runtime/nacl.scons',
     'src/trusted/validator_x86/nacl.scons',
     'src/trusted/weak_ref/nacl.scons',
+    'src/untrusted/crash_dump/nacl.scons',
     'src/untrusted/irt_stub/nacl.scons',
     'src/untrusted/nacl/nacl.scons',
     'src/untrusted/nacl_ppapi_util/nacl.scons',
@@ -3219,6 +3221,7 @@ irt_variant_tests = [
     'tests/toolchain/nacl.scons',
     'tests/unittests/shared/platform/nacl.scons',
     'tests/untrusted_check/nacl.scons',
+    'tests/untrusted_crash_dump/nacl.scons',
     #### ALPHABETICALLY SORTED ####
     ]