Keep two empty lines between declarations for cpp files

test/cctest/test-platform-tls.cc

 // Copyright 2011 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 25 matching lines @@
 using v8::internal::Thread;
 
 static const int kValueCount = 128;
 
 static Thread::LocalStorageKey keys[kValueCount];
 
 static void* GetValue(int num) {
   return reinterpret_cast<void*>(static_cast<intptr_t>(num + 1));
 }
 
+
 static void DoTest() {
   for (int i = 0; i < kValueCount; i++) {
     CHECK(!Thread::HasThreadLocal(keys[i]));
   }
   for (int i = 0; i < kValueCount; i++) {
     Thread::SetThreadLocal(keys[i], GetValue(i));
   }
   for (int i = 0; i < kValueCount; i++) {
     CHECK(Thread::HasThreadLocal(keys[i]));
   }
@@ skipping 17 matching lines @@
 
 class TestThread : public Thread {
  public:
   TestThread() : Thread("TestThread") {}
 
   virtual void Run() {
     DoTest();
   }
 };
 
+
 TEST(FastTLS) {
   for (int i = 0; i < kValueCount; i++) {
     keys[i] = Thread::CreateThreadLocalKey();
   }
   DoTest();
   TestThread thread;
   thread.Start();
   thread.Join();
 }