Fix flaky idle notification test.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 13541 matching lines @@
     rv = v8::V8::IdleNotification();
     if (rv)
       break;
   }
   CHECK(rv == true);
 }
 
 // Test that idle notification can be handled and eventually returns true.
 // This just checks the contract of the IdleNotification() function,
 // and does not verify that it does reasonable work.
-THREADED_TEST(IdleNotificationWithHint) {
+TEST(IdleNotificationWithHint) {
   v8::HandleScope scope;
   LocalContext env;
-  CompileRun("function binom(n, m) {"
-             "  var C = [[1]];"
-             "  for (var i = 1; i <= n; ++i) {"
-             "    C[i] = [1];"
-             "    for (var j = 1; j < i; ++j) {"
-             "      C[i][j] = C[i-1][j-1] + C[i-1][j];"
-             "    }"
-             "    C[i][i] = 1;"
-             "  }"
-             "  return C[n][m];"
-             "};"
-             "binom(1000, 500)");
+  {
+    i::AlwaysAllocateScope always_allocate;
+    CompileRun("function binom(n, m) {"
+               "  var C = [[1]];"
+               "  for (var i = 1; i <= n; ++i) {"
+               "    C[i] = [1];"
+               "    for (var j = 1; j < i; ++j) {"
+               "      C[i][j] = C[i-1][j-1] + C[i-1][j];"
+               "    }"
+               "    C[i][i] = 1;"
+               "  }"
+               "  return C[n][m];"
+               "};"
+               "binom(1000, 500)");
+  }
   bool rv = false;
   intptr_t old_size = HEAP->SizeOfObjects();
   bool no_idle_work = v8::V8::IdleNotification(10);
   for (int i = 0; i < 200; i++) {
     rv = v8::V8::IdleNotification(10);
     if (rv)
       break;
   }
   CHECK(rv == true);
   intptr_t new_size = HEAP->SizeOfObjects();
@@ skipping 2237 matching lines @@
   CompileRun("throw 'exception';");
 }
 
 
 TEST(CallCompletedCallbackTwoExceptions) {
   v8::HandleScope scope;
   LocalContext env;
   v8::V8::AddCallCompletedCallback(CallCompletedCallbackException);
   CompileRun("throw 'first exception';");
 }