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

ppapi/tests/test_cursor_control.cc

Index: ppapi/tests/test_cursor_control.cc
diff --git a/ppapi/tests/test_cursor_control.cc b/ppapi/tests/test_cursor_control.cc
index 80aca34696c452c83f2f0ceb7e64a81b72d0f3e3..ad5c8c503d602c7c78b63964617126d18bc939d1 100644
--- a/ppapi/tests/test_cursor_control.cc
+++ b/ppapi/tests/test_cursor_control.cc
@@ -21,8 +21,8 @@ bool TestCursorControl::Init() {
   return !!cursor_control_interface_;
 }
 
-void TestCursorControl::RunTest() {
-  RUN_TEST(SetCursor);
+void TestCursorControl::RunTests(const std::string& filter) {
+  RUN_TEST(SetCursor, filter);
 }
 
 std::string TestCursorControl::TestSetCursor() {