Adjust PPAPI tests so they can also be run in the NaCl build using PyAuto.

ppapi/tests/testing_instance.cc

Index: ppapi/tests/testing_instance.cc
===================================================================
--- ppapi/tests/testing_instance.cc	(revision 86338)
+++ ppapi/tests/testing_instance.cc	(working copy)
@@ -53,7 +53,10 @@
 }
 
 pp::Var TestingInstance::GetInstanceObject() {
-  return current_case_->GetTestObject();
+  if (current_case_)
+    return current_case_->GetTestObject();
+
+  return pp::Var(this, NULL);
 }
 
 void TestingInstance::HandleMessage(const pp::Var& message_data) {
@@ -115,6 +118,10 @@
     errors_.append("FAIL: Only listed tests");
   } else {
     current_case_->RunTest();
+    // Automated PyAuto tests rely on finding the exact strings below.
+    LogHTML(errors_.empty() ?
+            "<span class=\"pass\">[SHUTDOWN]</span> All tests passed." :
+            "<span class=\"fail\">[SHUTDOWN]</span> Some tests failed.");
   }
 
   // Declare we're done by setting a cookie to either "PASS" or the errors.