Keep two empty lines between declarations for cpp files

samples/lineprocessor.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 304 matching lines @@
       }
     }
     v8::String::Utf8Value str(result);
     const char* cstr = ToCString(str);
     printf("%s\n", cstr);
   }
 
   return true;
 }
 
+
 int main(int argc, char* argv[]) {
   int result = RunMain(argc, argv);
   v8::V8::Dispose();
   return result;
 }
 
 
 // Extracts a C string from a V8 Utf8Value.
 const char* ToCString(const v8::String::Utf8Value& value) {
   return *value ? *value : "<string conversion failed>";
@@ skipping 79 matching lines @@
 // The callback that is invoked by v8 whenever the JavaScript 'read_line'
 // function is called. Reads a string from standard input and returns.
 void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args) {
   if (args.Length() > 0) {
     v8::ThrowException(v8::String::New("Unexpected arguments"));
     return;
   }
   args.GetReturnValue().Set(ReadLine());
 }
 
+
 v8::Handle<v8::String> ReadLine() {
   const int kBufferSize = 1024 + 1;
   char buffer[kBufferSize];
 
   char* res;
   {
 #ifdef ENABLE_DEBUGGER_SUPPORT
     v8::Unlocker unlocker(v8::Isolate::GetCurrent());
 #endif  // ENABLE_DEBUGGER_SUPPORT
     res = fgets(buffer, kBufferSize, stdin);
   }
   if (res == NULL) {
     v8::Handle<v8::Primitive> t = v8::Undefined();
     return v8::Handle<v8::String>::Cast(t);
   }
   // Remove newline char
   for (char* pos = buffer; *pos != '\0'; pos++) {
     if (*pos == '\n') {
       *pos = '\0';
       break;
     }
   }
   return v8::String::New(buffer);
 }