PPAPI: Dial back the PostMessage threading test and re-enable on Win

ppapi/tests/test_post_message.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/tests/test_post_message.h"
 
 #include <algorithm>
 #include <sstream>
 
 #include "ppapi/c/dev/ppb_testing_dev.h"
@@ skipping 11 matching lines @@
 #endif
 
 REGISTER_TEST_CASE(PostMessage);
 
 namespace {
 
 const char kTestString[] = "Hello world!";
 const bool kTestBool = true;
 const int32_t kTestInt = 42;
 const double kTestDouble = 42.0;
+
+// On Windows XP bots, the NonMainThread test can run very slowly. So we dial
+// back the number of threads & messages when running on Windows.
+#ifdef PPAPI_OS_WIN
+const int32_t kThreadsToRun = 2;
+const int32_t kMessagesToSendPerThread = 5;
+#else
 const int32_t kThreadsToRun = 4;
 const int32_t kMessagesToSendPerThread = 10;
+#endif
 
 // The struct that invoke_post_message_thread_func expects for its argument.
 // It includes the instance on which to invoke PostMessage, and the value to
 // pass to PostMessage.
 struct InvokePostMessageThreadArg {
   InvokePostMessageThreadArg(pp::Instance* i, const pp::Var& v)
       : instance(i), value_to_send(v) {}
   pp::Instance* instance;
   pp::Var value_to_send;
 };
@@ skipping 438 matching lines @@
     ASSERT_TRUE(received_value <= kThreadsToRun);
     ++received_counts[received_value];
   }
   ASSERT_EQ(received_counts, expected_counts);
 
   message_data_.clear();
   ASSERT_TRUE(ClearListeners());
 
   PASS();
 }