Make it possible to enable/disable specific ppapi tests. Migrate PostMessage tests.

ppapi/tests/test_broker.cc

Index: ppapi/tests/test_broker.cc
diff --git a/ppapi/tests/test_broker.cc b/ppapi/tests/test_broker.cc
index b1d5b028c58cf2adedbc4f45237335461277dfb4..b7934171b3458c697c3e9b6b91169db73324f9c9 100644
--- a/ppapi/tests/test_broker.cc
+++ b/ppapi/tests/test_broker.cc
@@ -22,8 +22,8 @@ bool TestBroker::Init() {
   return !!broker_interface_;
 }
 
-void TestBroker::RunTest() {
-  RUN_TEST(Create);
+void TestBroker::RunTests(const std::string& filter) {
+  RUN_TEST(Create, filter);
 }
 
 std::string TestBroker::TestCreate() {