Split threaded cctests into four parts (instead of 2)

The number of cctests are now so large that this is causing timeouts
when only splitting these into two parts.
Review URL: http://codereview.chromium.org/6929063

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7801 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/cctest.h

@@ -98,7 +98,11 @@ class ApiTestFuzzer: public v8::internal::Thread {
   // The ApiTestFuzzer is also a Thread, so it has a Run method.
   virtual void Run();
 
-  enum PartOfTest { FIRST_PART, SECOND_PART };
+  enum PartOfTest { FIRST_PART,
+                    SECOND_PART,
+                    THIRD_PART,
+                    FOURTH_PART,
+                    LAST_PART = FOURTH_PART };
 
   static void Setup(PartOfTest part);
   static void RunAllTests();

test/cctest/test-api.cc

@@ -9008,11 +9008,10 @@ static unsigned linear_congruential_generator;
 void ApiTestFuzzer::Setup(PartOfTest part) {
   linear_congruential_generator = i::FLAG_testing_prng_seed;
   fuzzing_ = true;
-  int start = (part == FIRST_PART) ? 0 : (RegisterThreadedTest::count() >> 1);
-  int end = (part == FIRST_PART)
-      ? (RegisterThreadedTest::count() >> 1)
-      : RegisterThreadedTest::count();
-  active_tests_ = tests_being_run_ = end - start;
+  int count = RegisterThreadedTest::count();
+  int start =  count * part / (LAST_PART + 1);
+  int end = (count * (part + 1) / (LAST_PART + 1)) - 1;
+  active_tests_ = tests_being_run_ = end - start + 1;
   for (int i = 0; i < tests_being_run_; i++) {
     RegisterThreadedTest::nth(i)->fuzzer_ = new ApiTestFuzzer(
         i::Isolate::Current(), i + start);
@@ -9082,6 +9081,17 @@ TEST(Threading2) {
   ApiTestFuzzer::TearDown();
 }
 
+TEST(Threading3) {
+  ApiTestFuzzer::Setup(ApiTestFuzzer::THIRD_PART);
+  ApiTestFuzzer::RunAllTests();
+  ApiTestFuzzer::TearDown();
+}
+
+TEST(Threading4) {
+  ApiTestFuzzer::Setup(ApiTestFuzzer::FOURTH_PART);
+  ApiTestFuzzer::RunAllTests();
+  ApiTestFuzzer::TearDown();
+}
 
 void ApiTestFuzzer::CallTest() {
   if (kLogThreading)